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airlock

noun
/ˈeəlɒk/
/ˈerlɑːk/
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  1. a small room with a tightly closed door at each end, which you go through to reach another area at a different air pressure, for example on a spacecraft or submarine(航天器或潜艇等的)气闸舱,气密过渡舱
  2. a bubble of air that blocks the flow of liquid in a pump or pipe气塞

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