Loop Until Complete 循环指令
Food, oil, and other stocks flow into factories to produce fertilizer, to complete one feedback loop.
而食物、石油和其他一些库存流入工厂则生产出肥料，从而完成一个反馈回路。
As the loop progresses, each record is wrapped in its own directory entry tags; after the loop is complete, the setup for the buttons begins.
循环进行时，每条记录都被封装到记录自己的目录条目标记中；循环完成后，按钮的设置就开始了。
When the output is complete, the stream is flushed by writing a NULL object to the client stream and loop awaiting the next client.
输出完成后，通过向客户端流写入一个 NULL 对象，而且循环等待下一个客户端，从而刷新流。
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