... 封死（传球线路）：cut［close;block] off 严密封闭：bottle up 紧逼防守：press [pressure] defense ...
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严密封闭式螺杆泵 sealed screw pump ; airtight screw pump ; hermetic screw pump
严密封闭杜绝出入 seal off
严密封闭电念头 closing motor
非严密封闭式螺杆泵 non-hermetic screw pump
严密封闭形轴承 closed-type bearing
最严密封闭 maximum containment
最严密封闭［暂定 maximum containment
严密封闭液 sealing fluid
严密封闭形燃油阀 closed-type fuel valve
严密封闭
Tightly sealed
以上为机器翻译结果，长、整句建议使用 人工翻译 。
风扇环形外腔产生的正压湍流射流在内腔负压汇流作用下形成锥形风幕流场，将处于流场范围内的气体及粉尘严密封闭起来，使安全生产得到保障。
The tapered windscreen flow field of the fan is composed of the outer ring turbulent jet and the inner sink, which tightly closes gas and dust to ensure the safety production.
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