发送和接收出口的可能用途包括压缩或日志记录。
Possible uses for send and receive exits include compression or logging.
如果需要多个发送和接收出口，则使用逗号分隔名称。
If more that one send or receive exits are required, then enter their names separated by a comma.
如果有必要，可以在通道的任何一端安装互补的发送和接收出口。
If necessary, complementary send and receive exits can be installed at either end of the channel.
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