名词
中文翻译：齿轮
同义词：
['toothed bar', 'gear', 'toothed wheel']
例句：
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1. The car's engine is made up of many small gears.
这辆车的引擎由许多小齿轮组成。
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2. The train has a large number of gears to make it run smoothly.
火车有很多齿轮，使火车能够平稳运行。
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3. The machine uses gears to turn its wheels.
这台机器使用齿轮来转动它的轮子。