/ˈeəlɒk ||; ˈɛrˌlɑk/noun[C] 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 orSUBMARINE(= a type of ship that can travel under the water) 密封舱（两端有密封门，供人员从一处走到不同气压的另一处，如航天飞机或潜艇里的）
2 a bubble of air that blocks the flow of liquid in a pipe orPUMP 气塞