名词
中文翻译：轮轴
同义词：
['wheel axle', 'wheel hub', 'wheel bearing']
例句：
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1. The car's engine is running smoothly because the wheel axle is in good condition.
汽车发动机运行顺畅，因为轮轴状况良好。
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2. The old bicycle was so heavy that it couldn't be moved without help, and the wheel axle had broken.
这辆旧自行车太重了，没有帮助就无法移动，轮轴已经断了。
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3. The engineer carefully checked the wheel axle before starting the engine to ensure it wasfunctioning properly.
工程师在启动发动机前仔细检查了轮轴，以确保它正常工作。