E-mail functions further like a mailbox: the user can send messages whether or not the intended receiver is currently on the network and the message is stored, along with a signal for the receiver that indicates that there is a message waiting.

 
  • 电子函件的功能非常类似于邮箱:无论接收者是否在网络上,用户都可以向他发送消息,该消息被保存起来,同时向接收者发送一个信号表明有一个消息在等待处理。
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