As you then pull the stopper back out, you will hear air entering through the other valve.

正如你，然后拉回到塞子，您会听到空气进入，通过其他阀。

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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.

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。

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After placement of the bottom stopper, the valve on the top stopper was closed and the core was withdrawn from the surrounding sediments.

塞上底端的塞子后，关上顶端塞子上的阀门，之后将样品柱从周围沉积物中拉出。

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