Instead of wheels though, the motorcycle powers a set of gears which as the bike speeds up, begin to turn a sharpened metal coil inside the cylinder.

不过，摩托车不是为车轮提供动力，而是为一组齿轮提供动力，当自行车加速时，齿轮开始转动气缸内的锋利金属线圈。

In a mechanical clock, that’s done with gears: A different set of gears connects the pendulum to the hour hand, the minute hand, and the second hand, so they each move a different, specific amount as it swings.

在机械钟中，这是通过齿轮完成的：一组不同的齿轮将钟摆连接到时针、分针和秒针，因此它们在摆动时各自移动不同的特定量。