no-flow position 中间位置
The broker does not record how far through processing a multi-record file it is, so there is no concept of the broker flow restarting from the position where it stopped.
代理不记录处理多记录文件的进展状态，因此不存在从停止的位置重新开始代理流的概念。
The piston (38) drops under gravity to its lower position when there is no gas flow.
活塞(38)下降时，没有气流在重力作用下，以较低的位置。
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