英语翻译要求：翻译出来的中文通俗易懂,语句顺畅.百度翻译的中文不太好,有些难理解.下面是原文.Carrier Frequ

英语翻译
要求：翻译出来的中文通俗易懂,语句顺畅.百度翻译的中文不太好,有些难理解.下面是原文.
Carrier Frequencies and Multiplexing
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.The similarities provide the intuition needed to understand a fundamental principle:
Two or more signals that use different carrier frequencies can be transmitted over a single medium simultaneously without interference.
To understand the principle,consider how television transmission works.Each television station is assigned a channel number on which it broadcasts a signal.In fact,a channel number is merely shorthand for the frequency at which the station's carrier oscillates.To receive a transmission,a television receiver must be tuned to the same frequency as the transmitter.More important,a given city can contain many television stations that all broadcast on separate frequencies simultaneously.A receiver selects one to receive at any time.
Cable television illustrates that the principle applies to many signals traveling across a wire.Although a cable subscriber may have only one physical wire that connects to the cable company,the subscriber receives many channels of information simultaneously.The signal for one channel does not interfere with the signal for another.
Computer networks use the principle of separate channels to permit multiple communications to share a single,physical connection.Each sender transmits a signal using a particular carrier frequency.A receiver configured to accept a carrier at a given frequency will not be affected by signals sent at other frequencies.All carriers can pass over the same wire at the same time without interference.

载波频率和多路传输
计算机网络使用调制载波传输数据,类似电视台使用调制载波进行视频广播.这种相似性促使人们明白了这样一个基本原理：
使用不同载波频率的两个或多个信号可以通过单一的媒介进行传输而互不干扰.
要了解这一工作原理,先看一下电视信号是如何进行传输的.每个电视台被分配一个频道号,因此它只能广播一个信号.实际上,频道号只是对载波振荡频率的快速记忆.电视机接收传输信号时必须调整到与发射器相同的频率.更重要的是,某个城市可以有许多电视台在不同的频率上进行同步播出,而接收器在任何时候只能选择一个频道信号进行接收.
有线电视说明了这一原理,即多个信号可以通过同一根电缆进行传输.虽然有线电视用户可能只有一个物理线路连接到有线电视公司,但用户可以同时接收多个频道的信息,频道信号之间并不会相互干扰.
计算机网络使用这一频道分离技术,让多个频道信号共享同一个物理连接.每个信号发射台在发射信号时使用特定的载波频率.接收器在调节频道时,并不会受到其他信号的影响.这样,所有载波频率均可在同一根线上同步进行传输而不受干扰.
注：接收器可以是电视机或其它信号接收终端设备