1. having the postage paid by the sender. 
   由发信人付款的邮寄。
2. with cost of reply prepaid by sender. 
   发件人预付回复费用的。
3. A batch of mail dispatched at one time by a sender. 
   由邮递员同时分送的一批邮件
4. A type of response by a receiver that permits a sender to continue. 
   接收者允许发送者继续发送的一种响应类型。
5. In data communications, the transmission by a receiver of acknowledge characters as an affirmative response to a sender. 
   数据通信中，由接收方向发送方传送应答字符作为肯定回答的传输过程。

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