This would allow you to receive an acknowledgment of the message or receipt of delivery even if the response message is empty.

这样，即使响应消息为空，您也能够收到一个消息的确认或者交付收据。

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The basic method for achieving reliable delivery is for the sender to send the message repeatedly to the target until the target acknowledges receipt of the message.

实现可靠传递的基本方法是发送方反复向目标方发出消息直到目标方确认收到消息。

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Travelocity and the FAA recommended printing out a copy of the reservation receipt, which could be an e-mail message, although it was unclear what would constitute a valid receipt.

CNN: FAA imposes restrictions on e-tickets

Such input doesn't actually control battlefield assets, but it does send orders to the appropriate personnel so they can be executed, and soldiers confirm receipt of the order via instant message.

ENGADGET: Giant tablet lets commanders control war with the swipe of a finger