水下舰艇武器推进泵的机械密封装置的工作压力波动、使用频率小，并要求可靠性高。
The mechanical seal utilized in submarine's weapon ejection pump works under fluctuant working pressure and is used in low frequency, and high reliability is indispensable.
有一个真空泵把燃烧的产物推进管子，在管道行程的末端外面使这些产物彻底烧尽。
A vacuum pump pulled the products of combustion through the pipe and exhausted them outside at the end of the run.
一真空泵把燃烧的产物推进管子，在管道行程的末端将其释放掉。
A vacuum pump pulled the products of combustion through the pipe and exhausted them outside at the end of the run.
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