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1. The car has a speed changer that allows you to switch between different gears.
这辆车有一个变速器，可以让你在不同的档位之间切换。
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2. The engineer changed the speed changer on the machine to make it run more smoothly.
工程师更换了机器上的变速器，使机器运行得更加顺畅。
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3. The speed changer is responsible for adjusting the speed of the vehicle.
变速器负责调整车辆的速度。