2009-7-27 P,1
Unit 9
Serial Communications
Chapter Three
&Part4 Extensive Reading@ Part 1 Notes to Text
@Part5 Notes to Passage& Part 2 Word Study
@Part3 Practice on Text @Part6 Practice on Passage
2009-7-27 P,2
@ Part 1 Notes to Text
1)serial communications 串口通讯简介,串口通讯是指在一个时间内传输一位数字数据。从 19世纪的二进位电报编码，发展到现在的 RS-232(EIA-232)，主要用于连接终端和大型主机。串口通讯在过去的 40年里，大大推动了通讯技术的发展。本文主要阐述了关于串口通讯的串口按位（ bit）
发送和接收字节的基本概念。
2) On the other hand,when communicating with a timesharing
system over a modem,only a single channel is available,
and bit-serial transmission is required,另一方面，如果通过调制解调器与分时系统进行通讯，就只有一条通道可行，此时就需要用到位串行传输了。
注释,该句是并列句。现在分词短语 when communicating with…
作时间状语。
Serial Communications
2009-7-27 P,3
3) The popular Centronics printer interface is a case where byte-
serial transmission is used,广为流行的并行打印机接口就是一个使用字节串行传输的例子。
简介,Cenronics,称并口，也有称之为 IEEE1284，是目前外部设备与电脑连接常见的接口类型之一，另外还有其他接口类型包括：串口
（也有称之为 RS-232接口的）和 USB接口。
4) If two electrical transitions were required for each bit,as is
the case in non-return-to-zero coding,then at a rate of 9600
baud,only 4800 bits per second could be conveyed,如果每位数需要经过两次电子转换，就象非归零编码时所需要的那样，那么以
9600波特速度,每秒就只能传送 4800位。
注释,If two electrical transitions were … 是虚拟条件从句,表示对某种情况的假设 ; 习惯用语 as is the case in…,意思是“这与 …… 的情况一样”，在整句中作插入语，补充说明前文 two electrical
transitions were required for each bit。
2009-7-27 P,4
5) It does not include framing,formatting,and error detecting
bits that may be added to the information bits before a message
is transmitted,and will always be less than one.
它不包括位的构成，位的格式化以及位的错误检测，这些位会在信息传送前增加至信息位上，且永远也不会超过一个位。
注释,that may be…less than one 引导的是定语从句,修饰前面的
framing,formatting,and error detecting bits；注意 framing,
formatting and error detecting 均为名词 bits的修饰语。
End
2009-7-27 P,5 End
1,simultaneously adv,同时地 11,timesharing adj,分时的
2,sequentially adv,有序地，依次地 12,baud rate n,波特率
3,bit-serial adj,位串行的 13,correspond to 相当于，相似于
4,reassemble v 重新组合 14,efficiency n,效率
5,compose v 编写 15,detect v,检测，探测
6,peripheral n,外围设备，外挂设备 16,erroneously adv,错误地
7,feasible adj,可行的，可能的 17,bandwidth n,带宽，频带宽度
8,interface n,接口，界面 18,protocol n,协议
9,microprocessor n,微处理器 19,immunity n,免疫性
10,equivalent n,对应物,相应的事物
& Part 2 Word Study
2009-7-27 P,6
Task 1,Listening training
Dictation of some key words
Directions,You will hear some key words twice,most of which are taken from
the Word Study,Then finish the Crossword Puzzle,(See you book p,)
2,Dictation of some key expressions
Directions,You will hear some key expressions twice,most of which are
taken from this text,Then you are asked to complete the missing words.
@Part3 Practice on Text
1) most ____________messages
2) serial__________________
3) through eight_______________
4) ________interface__________
5) __________detecting________
6) an ______________convention
digital
transmission
parallel channels
serial standard
error bits
agreed-upon
2009-7-27 P,7
Read and Reply
Directions:Students are required to read aloud the whole text after
the teacher,Then give short answers to the following questions:
a) How does bit-serial transmission transfer a message?
b) Why is the transfer rate of byte-serial transmission
eight times higher than that of bit-serial transmission?
Task 2,Read,Write and Translate
Bit-serial transmission conveys a message one bit at a time
through a channel,Each bit represents a part of the message,
The individual bits are then reassembled at the destination to
compose the message,
Byte-serial transmission conveys eight bits at a time through
eight parallel channels,Eight channels are needed; the cost
thus may be as much as eight times higher to transmit the
message,
A communications protocol is an agreed-upon convention
that defines the order and meaning of bits in a serial transmission.
It may also specify a procedure for exchanging messages,
c) What does a communications protocol refer to?
2009-7-27 P,8
( ) 1) Bit-serial transmission converys a message one bit at a
time through a channel.
( ) 2) It is economic to use parallel channel while a short-
distance transmission is made.
( ) 3) Bit rate is atucally the same as baud rate,
( ) 4) Generally speaking,the maximum data rate is directly
proportional to channel’ s noise level,and inversely
proportional to the channel’ s bandwidth.
( ) 5) Channel efficiency is determined by the protocol design.
Read and Judge
End
T
T
F
F
T
2009-7-27 P,9
Directions:Read the following short passage,Complete it by filling in the missing words.
A,sequential B,publication C,applied in D,discrete E,refers to
F,refer to G,installments H,apply to I,irregular J,single
The term "serial" 1)________ the intrinsic property of a series —
namely its order,In literature,the term is used as a noun to
2)________ a format by which a story is told in contiguous
3)________ in sequential issues of a 4)________ periodica
5)__________.
More generally,"serial" is 6)________ library and information science
to materials "in any medium issued under the same title in a
succession of 7)________parts,usually numbered (or dated) and
appearing at regular or 8)________intervals with no predetermined
conclusion." By extension,"serial" also came to 9)________ a film
issued in the same installment manner over a period of
10)__________weeks at a single movie house.
Read and Complete
End
E
F
G J
B
C
D
I
H
A
2009-7-27 P,10
Read and Translate
Directions:Put the following sentences into English,using the words or phrases given.
End
Our large class is broken into small groups by teacher
during class.
Last night,a technical fault led to a break in transmission,
The computer was reassembled by students themselves,
His signature on the check doesn't correspond to the one in
his passport,
Emotional and environmental stresses can weaken the
body's immunity,
1)上课时，老师把我们这个大班分成若干个小组。（ break into
2)昨天晚上，技术故障导致电视节目播送中断。 (transmission)
3)这台电脑主机是学生自己重新安装的。 (reassemble)
4)他在支票上的签名和护照上的不一致。 (correspond to )
5)我们的免疫系统让我们防止感染。 (immunity)
2009-7-27 P,11
What is Serial?
Serial is a very common protocol (not to be confused with
Universal Serial Bus or USB) for device communication that comes
standard on just about every PC,Most computers include two RS-
232 based serial ports,Serial is also a common communication
protocol that is used by many devices for instrumentation(设备安装 );
numerous GPIB-compatible(兼容的 )devices also come with an RS-232
port,Furthermore,serial communication can be used for data
acquisition(采集 ) in conjunction with a remote sampling device,
The concept of serial communication is simple,The serial port
sends and receives bytes of information one bit at a time,Although
this is slower than parallel communication,which allows the
transmission of an entire byte at once,it is simpler and can be
used over longer distances,For example,the IEEE 488
specifications for parallel communication state that the cabling(电缆线路 )between equipment can be no more than 20 meters total,with
no more than 2 meters between any two devices; serial,however,
can extend as much as 1200 meters,
&Part4 Extensive Reading
2009-7-27 P,12
Typically,serial is used to transmit ASCII data,Communication is
completed using 3 transmission lines,(1) Ground,(2) Transmit,and (3)
Receive,Since serial is asynchronous,the port is able to transmit data
on one line while receiving data on another,Other lines are available
for handshaking,but are not required,The important serial
characteristics are baud rate,data bits,stop bits,and parity,For two
ports to communicate,these parameters(参数 ) must match:
Baud rate,a speed measurement for communication,It indicates the
number of bit transfers per second,For example,300 baud is 300 bits
per second,When we refer to a clock cycle we mean the baud rate,For
example,if the protocol calls for a 4800 baud rate,then the clock is
running at 4800Hz,This means that the serial port is sampling the data
line at 4800Hz,Common baud rates for telephone lines are 14400,
28800,and 33600,Baud rates greater than these are possible,but
these rates reduce the distance by which devices can be separated,
These high baud rates are used for device communication where the
devices are located together,as is typically the case with GPIB devices.
2009-7-27 P,13
Data bits,a measurement of the actual data bits in a transmission,
When the computer sends a packet of information,the amount of
actual data may not be a full 8 bits,Standard values for the data
packets are 5,7,and 8 bits,Which setting you choose depends on
what information you are transferring,For example,standard ASCII
has values from 0 to 127 (7 bits),Extended ASCII uses 0 to 255 (8
bits),If the data being transferred is simple text (standard ASCII),
then sending 7 bits of data per packet is sufficient for
communication,A packet refers to a single byte transfer,including
start/stop bits,data bits,and parity,Since the number of actual bits
depend on the protocol selected,the term packet is used to cover all
instances,
Stop bits,used to signal the end of communication for a single
packet,Typical values are 1,1.5,and 2 bits,Since the data is clocked
across the lines and each device has its own clock,it is possible for
the two devices to become slightly out of sync(同步 ),Therefore,the
stop bits not only indicate the end of transmission but also give the
computers some room for error in the clock
2009-7-27 P,14
speeds,The more bits that are used for stop bits,the greater the
lenience(容纳 ) in synchronizing the different clocks,but the slower
the data transmission rate.
Parity(奇偶校验 ),a simple form of error checking that is used in serial
communication,There are four types of parity,even,odd,marked,
and spaced,Of course,the option of using no parity is also available,
For even and odd parity,the serial port will set the parity bit (the last
bit after the data bits) to a value to ensure that the transmission has
an even or odd number of logic high bits,For example,if the data
was 011,then for even parity,the parity bit would be 0 to keep the
number of logic high bits even,If the parity was odd,then the parity
bit would be 1,resulting in 3 logic high bits,Marked and spaced
parity does not actually check the data bits,but simply sets the
parity bit high for marked parity or low for spaced parity,This allows
the receiving device to know the state of a bit so as to enable the
device to determine if noise is corrupting(腐蚀 )the data or if the
transmitting and receiving devices' clocks are out of sync.
End
2009-7-27 P,15
@Part5 Notes to Passage
1)Although this is slower than parallel communication,which
allows the transmission of an entire byte at once,it is simpler
and can be used over longer distances,这虽然比并行通信慢，
并行通信允许一次传输一个完整的字节，可是它却更为简单，而且可用于更长距离的通信。
注释,代词 this指代上文 The serial port sends and receives bytes
of information one bit at a time这件事；主句的主语 it则指代 The
serial port；该句是复合句，包含了两个从句：一个是由 Although
引导的让步状语，另一个是由 which引导的非限制性定语从句。
2)Since serial is asynchronous,the port is able to transmit data
on one line while receiving data on another,由于串行是异步的，
所以端口在一条线路上传送数据的同时，也能够在另一条线路上接收数据。
注释,since引导的是原因状语从句 ；此外,while doing… 并非是进行时态的省略形式，而是典型的现在分词短语作状语。相当于时间状语从句 while the port is receiving data on another。
2009-7-27 P,16 End
3)These high baud rates are used for device communication
where the devices are located together,as is typically the
case with GPIB devices,这些高波特率用于那些安置在一起的设备通信。 GPIB设备就是一个典型的例子。
注释：,as is typically the case” 是常见的由 as引导的固定结构，译为“典型的例子（情况）是 ……”,类似的还有,as is often the
case,，表示“情况往往如此”； GPIB是 General-Purpose
Interface Bus的缩写形式，译为“通用接口总线”。
4)If the data being transferred is simple text (standard ASCII),
then sending 7 bits of data per packet is sufficient for
communication,如果即将要传输的数据是简单的文本（标准的
ASCII），则每个包只需发出 7位数据就足以进行通信了。
注释,由 if引导的条件状语从句中,being transferred 是现在分词短语作后置定语，修饰名词 data，相当于 If the data which is being
transferred,..” 。
2009-7-27 P,17
1.Listening Challenge
Spot Dictation
Directions,The following passage will be heard 3 times,During the second time,you
are required to put the missing words or phrases in the numbered blanks according to
what you hear,The third time is for you to check your answers,Now the passage
begins.
The term,serial” has been used for a radio or television production with
a 1)______________evolving,unified plot and set of 2)____________,
spread over multiple episodes,While American television has introduced
some 3)______elements into their narratives,true,episodically
4)_____________ serials are rare in modern US television,They are
generally used within episodic series to generate 5)________ spikes,and
are usually limited to two parts,In the US,the most common form of the
serial 6)___________the mini-series.
In British television,"serial" is also 7)________________with the American
term "miniseries" - a short-run series with one title and 8)________,The
conclusion of the serial is sometimes,but not necessarily,the end of the
program as a whole,as 9)________ serials will sometimes be made,Many
British episodes are 10)________,or at least known to their production staff
and fans,by their episode number alone,
@Part6 Practice on Passage
End
continuously characters
serial numbered
ratings
remains
synonymous
plot
sequel
titled
2009-7-27 P,18
End of this Unit
Unit 9
Serial Communications
Chapter Three
&Part4 Extensive Reading@ Part 1 Notes to Text
@Part5 Notes to Passage& Part 2 Word Study
@Part3 Practice on Text @Part6 Practice on Passage
2009-7-27 P,2
@ Part 1 Notes to Text
1)serial communications 串口通讯简介,串口通讯是指在一个时间内传输一位数字数据。从 19世纪的二进位电报编码，发展到现在的 RS-232(EIA-232)，主要用于连接终端和大型主机。串口通讯在过去的 40年里，大大推动了通讯技术的发展。本文主要阐述了关于串口通讯的串口按位（ bit）
发送和接收字节的基本概念。
2) On the other hand,when communicating with a timesharing
system over a modem,only a single channel is available,
and bit-serial transmission is required,另一方面，如果通过调制解调器与分时系统进行通讯，就只有一条通道可行，此时就需要用到位串行传输了。
注释,该句是并列句。现在分词短语 when communicating with…
作时间状语。
Serial Communications
2009-7-27 P,3
3) The popular Centronics printer interface is a case where byte-
serial transmission is used,广为流行的并行打印机接口就是一个使用字节串行传输的例子。
简介,Cenronics,称并口，也有称之为 IEEE1284，是目前外部设备与电脑连接常见的接口类型之一，另外还有其他接口类型包括：串口
（也有称之为 RS-232接口的）和 USB接口。
4) If two electrical transitions were required for each bit,as is
the case in non-return-to-zero coding,then at a rate of 9600
baud,only 4800 bits per second could be conveyed,如果每位数需要经过两次电子转换，就象非归零编码时所需要的那样，那么以
9600波特速度,每秒就只能传送 4800位。
注释,If two electrical transitions were … 是虚拟条件从句,表示对某种情况的假设 ; 习惯用语 as is the case in…,意思是“这与 …… 的情况一样”，在整句中作插入语，补充说明前文 two electrical
transitions were required for each bit。
2009-7-27 P,4
5) It does not include framing,formatting,and error detecting
bits that may be added to the information bits before a message
is transmitted,and will always be less than one.
它不包括位的构成，位的格式化以及位的错误检测，这些位会在信息传送前增加至信息位上，且永远也不会超过一个位。
注释,that may be…less than one 引导的是定语从句,修饰前面的
framing,formatting,and error detecting bits；注意 framing,
formatting and error detecting 均为名词 bits的修饰语。
End
2009-7-27 P,5 End
1,simultaneously adv,同时地 11,timesharing adj,分时的
2,sequentially adv,有序地，依次地 12,baud rate n,波特率
3,bit-serial adj,位串行的 13,correspond to 相当于，相似于
4,reassemble v 重新组合 14,efficiency n,效率
5,compose v 编写 15,detect v,检测，探测
6,peripheral n,外围设备，外挂设备 16,erroneously adv,错误地
7,feasible adj,可行的，可能的 17,bandwidth n,带宽，频带宽度
8,interface n,接口，界面 18,protocol n,协议
9,microprocessor n,微处理器 19,immunity n,免疫性
10,equivalent n,对应物,相应的事物
& Part 2 Word Study
2009-7-27 P,6
Task 1,Listening training
Dictation of some key words
Directions,You will hear some key words twice,most of which are taken from
the Word Study,Then finish the Crossword Puzzle,(See you book p,)
2,Dictation of some key expressions
Directions,You will hear some key expressions twice,most of which are
taken from this text,Then you are asked to complete the missing words.
@Part3 Practice on Text
1) most ____________messages
2) serial__________________
3) through eight_______________
4) ________interface__________
5) __________detecting________
6) an ______________convention
digital
transmission
parallel channels
serial standard
error bits
agreed-upon
2009-7-27 P,7
Read and Reply
Directions:Students are required to read aloud the whole text after
the teacher,Then give short answers to the following questions:
a) How does bit-serial transmission transfer a message?
b) Why is the transfer rate of byte-serial transmission
eight times higher than that of bit-serial transmission?
Task 2,Read,Write and Translate
Bit-serial transmission conveys a message one bit at a time
through a channel,Each bit represents a part of the message,
The individual bits are then reassembled at the destination to
compose the message,
Byte-serial transmission conveys eight bits at a time through
eight parallel channels,Eight channels are needed; the cost
thus may be as much as eight times higher to transmit the
message,
A communications protocol is an agreed-upon convention
that defines the order and meaning of bits in a serial transmission.
It may also specify a procedure for exchanging messages,
c) What does a communications protocol refer to?
2009-7-27 P,8
( ) 1) Bit-serial transmission converys a message one bit at a
time through a channel.
( ) 2) It is economic to use parallel channel while a short-
distance transmission is made.
( ) 3) Bit rate is atucally the same as baud rate,
( ) 4) Generally speaking,the maximum data rate is directly
proportional to channel’ s noise level,and inversely
proportional to the channel’ s bandwidth.
( ) 5) Channel efficiency is determined by the protocol design.
Read and Judge
End
T
T
F
F
T
2009-7-27 P,9
Directions:Read the following short passage,Complete it by filling in the missing words.
A,sequential B,publication C,applied in D,discrete E,refers to
F,refer to G,installments H,apply to I,irregular J,single
The term "serial" 1)________ the intrinsic property of a series —
namely its order,In literature,the term is used as a noun to
2)________ a format by which a story is told in contiguous
3)________ in sequential issues of a 4)________ periodica
5)__________.
More generally,"serial" is 6)________ library and information science
to materials "in any medium issued under the same title in a
succession of 7)________parts,usually numbered (or dated) and
appearing at regular or 8)________intervals with no predetermined
conclusion." By extension,"serial" also came to 9)________ a film
issued in the same installment manner over a period of
10)__________weeks at a single movie house.
Read and Complete
End
E
F
G J
B
C
D
I
H
A
2009-7-27 P,10
Read and Translate
Directions:Put the following sentences into English,using the words or phrases given.
End
Our large class is broken into small groups by teacher
during class.
Last night,a technical fault led to a break in transmission,
The computer was reassembled by students themselves,
His signature on the check doesn't correspond to the one in
his passport,
Emotional and environmental stresses can weaken the
body's immunity,
1)上课时，老师把我们这个大班分成若干个小组。（ break into
2)昨天晚上，技术故障导致电视节目播送中断。 (transmission)
3)这台电脑主机是学生自己重新安装的。 (reassemble)
4)他在支票上的签名和护照上的不一致。 (correspond to )
5)我们的免疫系统让我们防止感染。 (immunity)
2009-7-27 P,11
What is Serial?
Serial is a very common protocol (not to be confused with
Universal Serial Bus or USB) for device communication that comes
standard on just about every PC,Most computers include two RS-
232 based serial ports,Serial is also a common communication
protocol that is used by many devices for instrumentation(设备安装 );
numerous GPIB-compatible(兼容的 )devices also come with an RS-232
port,Furthermore,serial communication can be used for data
acquisition(采集 ) in conjunction with a remote sampling device,
The concept of serial communication is simple,The serial port
sends and receives bytes of information one bit at a time,Although
this is slower than parallel communication,which allows the
transmission of an entire byte at once,it is simpler and can be
used over longer distances,For example,the IEEE 488
specifications for parallel communication state that the cabling(电缆线路 )between equipment can be no more than 20 meters total,with
no more than 2 meters between any two devices; serial,however,
can extend as much as 1200 meters,
&Part4 Extensive Reading
2009-7-27 P,12
Typically,serial is used to transmit ASCII data,Communication is
completed using 3 transmission lines,(1) Ground,(2) Transmit,and (3)
Receive,Since serial is asynchronous,the port is able to transmit data
on one line while receiving data on another,Other lines are available
for handshaking,but are not required,The important serial
characteristics are baud rate,data bits,stop bits,and parity,For two
ports to communicate,these parameters(参数 ) must match:
Baud rate,a speed measurement for communication,It indicates the
number of bit transfers per second,For example,300 baud is 300 bits
per second,When we refer to a clock cycle we mean the baud rate,For
example,if the protocol calls for a 4800 baud rate,then the clock is
running at 4800Hz,This means that the serial port is sampling the data
line at 4800Hz,Common baud rates for telephone lines are 14400,
28800,and 33600,Baud rates greater than these are possible,but
these rates reduce the distance by which devices can be separated,
These high baud rates are used for device communication where the
devices are located together,as is typically the case with GPIB devices.
2009-7-27 P,13
Data bits,a measurement of the actual data bits in a transmission,
When the computer sends a packet of information,the amount of
actual data may not be a full 8 bits,Standard values for the data
packets are 5,7,and 8 bits,Which setting you choose depends on
what information you are transferring,For example,standard ASCII
has values from 0 to 127 (7 bits),Extended ASCII uses 0 to 255 (8
bits),If the data being transferred is simple text (standard ASCII),
then sending 7 bits of data per packet is sufficient for
communication,A packet refers to a single byte transfer,including
start/stop bits,data bits,and parity,Since the number of actual bits
depend on the protocol selected,the term packet is used to cover all
instances,
Stop bits,used to signal the end of communication for a single
packet,Typical values are 1,1.5,and 2 bits,Since the data is clocked
across the lines and each device has its own clock,it is possible for
the two devices to become slightly out of sync(同步 ),Therefore,the
stop bits not only indicate the end of transmission but also give the
computers some room for error in the clock
2009-7-27 P,14
speeds,The more bits that are used for stop bits,the greater the
lenience(容纳 ) in synchronizing the different clocks,but the slower
the data transmission rate.
Parity(奇偶校验 ),a simple form of error checking that is used in serial
communication,There are four types of parity,even,odd,marked,
and spaced,Of course,the option of using no parity is also available,
For even and odd parity,the serial port will set the parity bit (the last
bit after the data bits) to a value to ensure that the transmission has
an even or odd number of logic high bits,For example,if the data
was 011,then for even parity,the parity bit would be 0 to keep the
number of logic high bits even,If the parity was odd,then the parity
bit would be 1,resulting in 3 logic high bits,Marked and spaced
parity does not actually check the data bits,but simply sets the
parity bit high for marked parity or low for spaced parity,This allows
the receiving device to know the state of a bit so as to enable the
device to determine if noise is corrupting(腐蚀 )the data or if the
transmitting and receiving devices' clocks are out of sync.
End
2009-7-27 P,15
@Part5 Notes to Passage
1)Although this is slower than parallel communication,which
allows the transmission of an entire byte at once,it is simpler
and can be used over longer distances,这虽然比并行通信慢，
并行通信允许一次传输一个完整的字节，可是它却更为简单，而且可用于更长距离的通信。
注释,代词 this指代上文 The serial port sends and receives bytes
of information one bit at a time这件事；主句的主语 it则指代 The
serial port；该句是复合句，包含了两个从句：一个是由 Although
引导的让步状语，另一个是由 which引导的非限制性定语从句。
2)Since serial is asynchronous,the port is able to transmit data
on one line while receiving data on another,由于串行是异步的，
所以端口在一条线路上传送数据的同时，也能够在另一条线路上接收数据。
注释,since引导的是原因状语从句 ；此外,while doing… 并非是进行时态的省略形式，而是典型的现在分词短语作状语。相当于时间状语从句 while the port is receiving data on another。
2009-7-27 P,16 End
3)These high baud rates are used for device communication
where the devices are located together,as is typically the
case with GPIB devices,这些高波特率用于那些安置在一起的设备通信。 GPIB设备就是一个典型的例子。
注释：,as is typically the case” 是常见的由 as引导的固定结构，译为“典型的例子（情况）是 ……”,类似的还有,as is often the
case,，表示“情况往往如此”； GPIB是 General-Purpose
Interface Bus的缩写形式，译为“通用接口总线”。
4)If the data being transferred is simple text (standard ASCII),
then sending 7 bits of data per packet is sufficient for
communication,如果即将要传输的数据是简单的文本（标准的
ASCII），则每个包只需发出 7位数据就足以进行通信了。
注释,由 if引导的条件状语从句中,being transferred 是现在分词短语作后置定语，修饰名词 data，相当于 If the data which is being
transferred,..” 。
2009-7-27 P,17
1.Listening Challenge
Spot Dictation
Directions,The following passage will be heard 3 times,During the second time,you
are required to put the missing words or phrases in the numbered blanks according to
what you hear,The third time is for you to check your answers,Now the passage
begins.
The term,serial” has been used for a radio or television production with
a 1)______________evolving,unified plot and set of 2)____________,
spread over multiple episodes,While American television has introduced
some 3)______elements into their narratives,true,episodically
4)_____________ serials are rare in modern US television,They are
generally used within episodic series to generate 5)________ spikes,and
are usually limited to two parts,In the US,the most common form of the
serial 6)___________the mini-series.
In British television,"serial" is also 7)________________with the American
term "miniseries" - a short-run series with one title and 8)________,The
conclusion of the serial is sometimes,but not necessarily,the end of the
program as a whole,as 9)________ serials will sometimes be made,Many
British episodes are 10)________,or at least known to their production staff
and fans,by their episode number alone,
@Part6 Practice on Passage
End
continuously characters
serial numbered
ratings
remains
synonymous
plot
sequel
titled
2009-7-27 P,18
End of this Unit
