两个或更多台站间相互完成了通信即为进行了一次交换。交换程序包括以下内容：初始呼叫、回答呼叫、确定工作频道、发送信文、回答信文、终止发送。

This applies when two or more stations achieve communication with each other. An exchange is then said to be taking place. It consists of the following.

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逆转平行生命，并将非物质梦想与物质层梦想相互交换，是无法为所有人终止痛苦的。

Reversing parallel lives and trading nonphysical for physical dreams cannot end the suffering for all;

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