名词中文翻译
中文翻译：手动螺旋式减速器
同义词：
['hand-operated gearbox', 'hand-screwed gearbox']
例句：
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1. The newcar has a hand-screw-down gear that makes it easy to change the engine speed.
这款新车有一个手拧式减速器，可以轻松更换引擎速度。
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2. The old farm tractor had a manual gearbox that required a lot of work to change the gears.
旧农用拖拉机有一个手动齿轮箱，需要很多工作来换挡。
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3. The engineer used a hand-screw-down gear to make the machine more efficient.
工程师使用一个手动螺旋式减速器使机器更高效。