单词：piston effect
piston effect的用法和样例：
例句
- In addition, the piston effect of each train is weakened even counteracted with each other thus the natural ventilation performance of the piston effect will abate.两列车相向行驶时，各自的活塞效应会减弱甚至相互抵消，不利于区间隧道内的自然通风。
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