While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.

虽然你的个人电脑只能保存一个文件的一个副本，但像 Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。

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It is enough to copy a program to the destination computer to make it run.

通过这种方式很容易把程序拷贝到目标计算机，并使它运行起来。

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Nate has hacked into Mr. Hudson's computer. He can get a copy of the final exam for them.

奈特入侵了哈德森老师的电脑，他可以帮他们拿到一份期末考题。

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Best of all, you don't have to worry about entering a product tracking code every time you download and install a copy on a computer.

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The Human Brain Project will attempt to build a computer-based copy of a human brain to understand neurological disorders and the effects of drugs.

BBC: Europe gives 2bn euros to science

Every time you sign a transaction, you type in sequences of digits from the computer screen into the device, and then copy other sequences of digits displayed by the device back into the computer.

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