名词
中文翻译：Unknown
同义词：
['flat rotation', 'flat bearing', 'flat surface']
例句：
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1. The car's engine is designed with a flat spindle for smooth operation.
汽车发动机设计有平轴，以实现平稳运行。
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2.The flat spindle on the table is perfect for holding books and papers.
桌子上的平轴非常适合放置书籍和文件。
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3.The flat spindle in the machine is crucial for its smooth operation.
机器中的平轴对于其平稳运行至关重要。