名词
中文翻译：紧急降低手柄
同义词：
['handle', 'lever', 'knob例句：1. The emergency lowering handle on the fire extinguisher is a lifesaver inemergencies.（灭火器上的紧急下降手柄在紧急情况下是救生器。）']
例句：
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1. The emergency lowering handle on the fire extinguisher is a lifesaver inemergencies.
灭火器上的紧急下降手柄在紧急情况下是救生器。
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2. The engineerused the lever to adjust the gearson the car's engine.
工程师使用杠杆来调整汽车引擎的齿轮。
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3. The knob on the door handle was worndown from frequent use.
门把手上的旋钮由于频繁使用而磨损。