post office protocol(POP)一种规定个人计算机怎样连接到Internet上的邮件服务器和下载电子邮件的协议。
客户机利用POP（邮局协议）从因特网服务器上检索邮件。
POP (Post Office Protocol) is used by the client to retrieve mail from an Internet server.
这些协议如同邮局的规定：收件人和回信地址须写在信封上，信封的大小。
These protocols are like the post office's specification of how recipient and return addresses should appear on envelopes and which sizes are allowable for envelopes.
你要与邮局签个协议，然后就可以使用此项业务了。
You may sign an agreement with our post office. The box will be available.
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