名词
中文翻译：单速轴
同义词：
['single-speed gear', 'single-speed shaft']
例句：
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1.The car has a single-speed axle that makes it easy to start and stop.
这辆车有一个单速轴，使得启动和停止都很容易。
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2. The old bicycle had a single-speed axle that made it easy to pedal.
旧自行车有一个单速轴，使得踩踏板变得容易。
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3. The new car has a single-speed axle that reduces the amount of effort needed to accelerate.
这款新车有一个单速轴，减少了加速所需的努力。