名词
中文翻译：下框架
同义词：
['understructure', 'underpinning例句：1. The engineers worked on the underframe of the bridge for several days.（工程师们花了几天时间来修理桥梁的下框架。）2. The construction crew was working on the underframe of the new building.（建筑工人正在新建筑物的下框架上工作。）3. The underframe of the car is designed to support the weight of the vehicle.（汽车的下框架设计用来支撑车辆的重量。）']
例句：
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1. The engineers worked on the underframe of the bridge for several days.
工程师们花了几天时间来修理桥梁的下框架。
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2. The construction crew was working on the underframe of the new building.
建筑工人正在新建筑物的下框架上工作。
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3. The underframe of the car is designed to support the weight of the vehicle.
汽车的下框架设计用来支撑车辆的重量。