本操作仅适用于通信双方采用长连接通信方式时用于保持连接。
The operation is only used to maintain a long connection between two communication parties.
这种语言只有该通信双方能够“读懂”。
在何种传输中，信道是通信双方设备一直共用的？
In transmission, the channel capacity is Shared by the both communicating devices at all time.
另外，通信的双方也不必知道对方存取数据的时间。
Furthermore they need not to know what time partners read or write the data.
另外，通信的双方也不必知道对方存取数据的时间。
Furthermore they need not to know what time partners read or write the data.
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