C、C++、C#、java主要用途？他们分别用在哪个领域？
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cc
carbon copy
An option in most e-mail programs, it allows you to send plicate copies of an e-mail message. When you type a recipient's e-mail address in the cc field, it is viewable to everyone who receives the e-mail message (as opposed to a bcc or "blind" carbon copy recipient).
副本的意思，通常是用于Email中的
