动词
中文翻译：预排气
同义词：
['vent', 'exhaust', 'discharge']
例句：
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1.Before the race, the athletes were preexhausted by the rigorous training.
比赛前，运动员们因为艰苦的训练而感到疲惫不堪。
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2.The factory had to preexhaust its exhaust gases before venting them into the atmosphere.
工厂在向大气排放废气之前，必须先排放其废气。
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3.The car's engine was preexhausting as it accelerated down the highway.
汽车加速行驶时发动机正在提前排出废气。