名词
中文翻译：Unknown
同义词：
['cog', 'gearbox', 'transmission']
例句：
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1.The car's engine is powered bya powerful gear.
这辆车的引擎由一个强大的齿轮驱动。
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2. The train has severalgears to adjust its speed.
火车有多个档位来调整速度。
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3. The gears on the machine are designed to beeasy to operate.
机器上的齿轮设计得易于操作。