名词
中文翻译：备用轴
同义词：
['support shaft', 'reserve shaft']
例句：
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1. The machine has a back-up shaft to ensure smooth operation incase of power failure.
这台机器有一个备用轴，以确保在电力故障时能正常运行。
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2. During construction, the engineers useda back-up shaft to bypassthe damaged area.
在施工期间，工程师们使用了备用轴来绕过受损区域。
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3. Theconstruction crew had to use a back-up shaft to transport heavy equipment during therainstorm.
在暴风雨期间，建筑工人不得不使用备用轴来运输重型设备。