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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