电信专业英英词典F-2

　　Focal Length - Distance from the exact center of the dish to the center of the feed.

　　Focal Point - The physical point in space toward which the satellite reflector dish directs the received signal so it can be processed.

　　Format¹ - This is (1) the general makeup² and organization of a file, or (2) the arrangement of bits of characters within a group.

　　Forum³ - This is a section of a website or online service, wherein you can communicate with other forum members about a common subject.

　　Forward - This is the act of redirecting a particular email, an entire email address, or a telephone number.

　　Forward Error Correction (FEC) - The purpose of this element is to add unique codes to the digital signal at the output source so problems can be detected at the signal receiver.

　　Freeware - This is software that is free to use and distribute. Some freeware, though, requires that you don't make any changes or alterations⁴ to the code.

　　Frequency - The number of times that a wave or wave-like process goes through its complete cycle per second of time. Frequency is measured in hertz (Hz), which is one cycle per second.

　　Frequency Band - This is a particular band of frequencies in the electromagnetic spectrum⁵, expressed in Hertz, in which satellite signals are transmitted.

　　Frequency Coordination⁶ - A process that is implemented⁷ to attenuate⁸ frequency interference between different satellite networks.

　　Frequency Division Multiplexing - This is an older method of dividing the bandwidth available for transmission into distinct narrow bands for individual transmission channels.

　　Frequency Modulation⁹ (FM) - The signal carries the desired information by varying the frequency of the carrier wave.

　　Frequency Shift Keying (FSK) - This is another modulation technique (see Frequency Modulation) used to transmit data. It shifts the frequency above and below the carrier frequency (representing 1 and 0, respectively).

　　Frequency Spectrum - This is a range of frequencies (and is similar to bandwidth).

　　FSK - see Frequency Shift Keying.

　　Full Duplex - This is the same as Duplex and is simultaneous transmission of data in two opposite directions.

1 format   

n.设计，版式；[计算机]格式，DOS命令:格式化(磁盘)，用于空盘或使用过的磁盘建立新空盘来存储数据；v.使格式化，设计，安排

参考例句：

• Please format this floppy disc.请将这张软盘格式化。
• The format of the figure is very tasteful.该图表的格式很雅致。

2 makeup   

n.组织；性格；化装品

参考例句：

• Those who failed the exam take a makeup exam.这次考试不及格的人必须参加补考。
• Do you think her beauty could makeup for her stupidity?你认为她的美丽能弥补她的愚蠢吗？

3 forum   

n.论坛，讨论会

参考例句：

• They're holding a forum on new ways of teaching history.他们正在举行历史教学讨论会。
• The organisation would provide a forum where problems could be discussed.这个组织将提供一个可以讨论问题的平台。

4 alterations   

n.改动( alteration的名词复数 )；更改；变化；改变

参考例句：

• Any alterations should be written in neatly to the left side. 改动部分应书写清晰，插在正文的左侧。 来自《简明英汉词典》
• Gene mutations are alterations in the DNA code. 基因突变是指DNA 密码的改变。 来自《简明英汉词典》

5 spectrum   

n.谱，光谱，频谱；范围，幅度，系列

参考例句：

• This is a kind of atomic spectrum.这是一种原子光谱。
• We have known much of the constitution of the solar spectrum.关于太阳光谱的构成，我们已了解不少。

6 coordination   

n.协调，协作

参考例句：

• Gymnastics is a sport that requires a considerable level of coordination.体操是一项需要高协调性的运动。
• The perfect coordination of the dancers and singers added a rhythmic charm to the performance.舞蹈演员和歌手们配合得很好，使演出更具魅力。

7 implemented   

v.实现( implement的过去式和过去分词 )；执行；贯彻；使生效

参考例句：

• This agreement, if not implemented, is a mere scrap of paper. 这个协定如不执行只不过是一纸空文。 来自《现代汉英综合大词典》
• The economy is in danger of collapse unless far-reaching reforms are implemented. 如果不实施影响深远的改革，经济就面临崩溃的危险。 来自辞典例句

8 attenuate   

v.使变小，使减弱

参考例句：

• Then we got involved with trying to find polymers that attenuate radiation.接著我们致力于找出能够减弱辐射的聚合物。
• In a forest,wet wood and needles attenuate the signals.在森林中，潮湿的树木与针叶会使讯号变弱。

9 modulation   

n.调制

参考例句：

• The soft modulation of her voice soothed the infant. 她柔和的声调使婴儿安静了。
• Frequency modulation does not allow static to creep in. 频率调制不允许静电干扰混入。