名词短语
中文翻译：Unknown
同义词：
['gear', 'gearbox', 'gears', 'cogwheel', 'pinion', 'wheel', 'wheelset', 'pulley', 'pulleys', 'axle', 'axles']
例句：
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1. The car has a gear that can be adjusted to change the speed.
这辆车有一个可以调整的齿轮来改变速度。
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2. The gears on the machine are designed to make it easy to turn the handle.
机器上的齿轮被设计成使转动手柄变得容易。
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3. The gears in the transmission system are responsible for transferring power from the engine tothe wheels.
传动系统中的齿轮负责将动力从发动机传递到车轮。