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英语翻译Digital signals which are used by computers are made up

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英语翻译
Digital signals which are used by computers are made up of separate units usually represented by a sreies of 1's and 0's
Analog signals vary continuously an example of an analog signals is a sound wave Modems are often used to enable computers to communicate with each other across telephone lines
计算机所使用的数字信号是由独立分开的单元组成的,这些单元通常用一连串的数字“1”和“0”表示.
模拟信号是连续变化的;声波就是模拟信号的一个例子.
调制解调器常用于实现计算机之间通过电话线的互相通信.
你原句第二句中间应该有个分号
Analog signals vary continuously ;an example of an analog signals is a sound wave