名词
中文翻译：螺丝式齿轮
同义词：
['screw-in gear', 'screw-on gear']
例句：
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1.The new car has a screwdown gear system that makes it easy to start and accelerate.
这款新车采用了易于启动和加速的螺丝式齿轮系统。
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2. The old machine had a screwdown gear that was difficult to remove without tools.
旧机器有一个难以拆卸的螺丝式齿轮，没有工具很难拆下。
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3.The engineer replaced the screwdown gear with a more efficient design.
工程师用更高效的设计替换了螺丝式齿轮。