计算机专业英语教程第5版翻译(19)

计算机专业英语教程第5版翻译 绝对准确

许多手提电脑也可以建立有互联网的连接;如果不能,可以使用一个无线调制解调器。

Alternately, a modem or other type of adapter can connect the device to a cell phone.

Alternately 交替地

交替地，一个调制解调器或者其他类型的适配器可以连接设备到手机。

Notebook PCs can connect to the Internet or a corporate network using either a wireless modem or cell modem. corporate 公司的 cell modem 细胞调制解调器

笔记本电脑使用无线调制解调器或者细胞调制解调器可以连接到因特网或者一个公司的网络。

Some notebook computers today come with wireless capability built into the unit.

come with 伴随 built into 固定于

现在的一些笔记本电脑伴随有固定了无线能力的单元。

《计算机专业英语教程》（第4版）

6.2 Carrier Frequencies and Multiplexing

载波频率和多路复用

@ Computer networks that use a modulated carrier wave to transmit data are similar to television stations that use a modulated carrier wave to broadcast video.

modulated 已调制的

使用调制载波发送数据的计算机网络和利用调制载波广播视频信息的电视台相类似。

The similarities provide the intuition needed to understand a fundamental principle:

similarity 相似性 intuition 直观

这一相似性给理解下述基本原理提供了启示：

Two or more signals that use different carrier frequencies can be transmitted over a single medium simultaneously without interference.

signal 信号 simultaneously 同时地 interference 干扰

两个或多个使用不同载波频率的信号可以在单一介质上同时传输而互不干扰。

@ To understand the principle, consider how television transmission works.

为理解这一原理，考虑（有线）电视传输是如何工作的。

Each television station is assigned a channel number on which it broadcasts a signal.

channel 频道

每个电视台都分配一个频道号，它在该频道上广播信号。

In fact, a channel number is merely shorthand for the frequency at which the station's carrier oscillates. shorthand 速记 oscillate 振荡

事实上,频道号就是电视台载波用的振荡频率的速记。

To receive a transmission, a television receiver must be tuned to the same frequency as the transmitter. tune to 调谐到

为接收一个频道传输，电视接收器必须调谐到与发送器相同的频率。

More important, a given city can contain many television stations that all broadcast on separate frequencies simultaneously.

更重要的是，一个城市可以有许多电视台，它们彼此在不同的频率上同时广播。

A receiver selects one to receive at any time.

一个接收器在任一时间选择接收其中一个。