名词
中文翻译：车厢底架
同义词：
['underframe', 'undercarriage frame', 'carriage frame']
例句：
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1. The engineer carefully inspected the carriage underframe before starting the engine.
工程师在启动引擎之前仔细检查了车厢底架。
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2.The underframe of the train is designed to withstand heavy loads.
火车的底架设计用来承受重负载。
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3.The underframe of the car was damaged during a collision.
汽车的底架在一次碰撞中受损。