换句话说，数据库不能处于未完成状态。
提交作业时，它一开始处于未完成状态。
When you submit a job, it will start out with incomplete status.
窗口大小决定了已发送且当前处于未完成状态(等待接收确认消息)的消息的数量。
The window size determines the number of messages that have been sent but are currently outstanding, waiting for an acknowledgement to be received.
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