往复泵启动前必须将排出管路中的阀门打开。

Reciprocating pump discharge pipe must be before the start of the valve to open.

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法国工程师正在冰层上钻洞，用泵将湖水排出。

French engineers are drilling a hole into the ice to pump the water away.

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法国工程师正在冰层上钻洞，用泵将湖水排出。

French engineers are drilling a hole into the ice to pump the water away.

youdao