螺杆泵螺杆
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crew pump 螺杆泵
crew pump with square thread 方形螺杆泵
pump crew 泵浦组
crew vane pump 螺旋形滑片泵
Crew members must also pump mud of the proper weight into it.
此时要向井筒中泵注适当比重的泥浆。
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Crew ate informed to pump out the water to free the liferaft from water.
通知船员将水泵出，让救生筏从水中浮起。
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