Speed change gears is widely used in mechanical transmission system.

机械传动系统中广泛使用齿轮变速装置。

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Gears help them change speed — like on a bicycle. Switch gears. So is this a biking expression? Let's listen.

齿轮帮助他们改变速度——像自行车一样。所以这个一个自行车的表达吗？我们听一听。

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This expression is based on the idea that a machine or vehicle will change speed when you change the gears. And that's English in a minute.

这个表达出自于机器或者齿轮会由于齿轮的改变而改变速度的原理。以上就是英语一分钟的内容。

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There's an automatic mode to BMW's SMG, and it happens to be a very pleasing system, with adjustable shift speed so you can dial in how smoothly gears change.

FORBES: Vehicles Feature