In addition, the pump seal life of lower, less variety.
另外，泵的密封寿命低，中开泵品种少。
A cement bridge used in a well to seal the lower portion of the well.
在井中为封堵井的下部所用的水泥塞。
Attack the carrier waterline key water seal between the upper and lower positions.
打击航母水线上下之间关键水密封仓。
Attack the carrier waterline key water seal between the upper and lower positions.
打击航母水线上下之间关键水密封仓。
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