名词
中文翻译：底部轴
同义词：
['base shaft', 'bottom shaft']
例句：
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1.The machine's bottom shaft is worn out.
这台机器的底部轴磨损了。
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2. The construction crew had to replace the bottom shaft of the crane.
建筑工人不得不更换起重机的底部轴。
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3.The engineer inspected the bottom shaft for any signs of wear or damage.
工程师检查了底部轴是否有磨损或损坏的迹象。