Michael在天花板上的排气管道中爬行，通过下面的排气口了解自己的方位。
Michael moves through the ducts above the ceiling, crawling along on his belly, and peering below him through the air vent system.
为此，从滤池闭水检漏、滤梁、滤板及布气管等方面介绍了曝气生物滤池在施工过程中的注意事项。
Therefore, matters needing attention during the construction were introduced in aspects of water leakage detection, filter girder, filter board and aeration pipe.
在煤气管道上安装液压翻板阀，通过操作翻板代替人工抽堵盲板作业可以提高工作效率，降低劳动强度和作业危险性。
The special hydraulic valve taking the place of the stopper for gas pipe has improved the efficiency, decreased the intensity and danger in the operation of gas.
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