名词
中文翻译：底架
同义词：
['base', 'baseplate', 'bottom bracket']
例句：
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1.The car's engine is located at the bottom bracket.
汽车的发动机位于底架。
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2.The engineer used a bottom bracket to support the heavy machine.
工程师使用底架来支撑这台重机器。
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3.The construction worker needs to adjust the bottom bracket for the new building.
建筑工人需要调整新建筑物的底架。