注意，一旦发送完所有排队等待的消息后，它将关闭连接。
Notice that once it has sent all of the queued up messages, it closes the connection.
喜欢一对一的交流对话，当发送完得到满意的情况下。
Like a conversation, one-on-one communication finishes when the sender get the satisfied feedback from the responder.
连接关闭：在发送完所有数据之后，通信伙伴中的一方想要关闭连接。
Connection shutdown: Once all the data have been sent, one of the communication partners will want to shut down the connection.
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