定义
the gears (of a bicycle, car): （自行车，小车的）齿轮
to shift, change gears 变档,改变齿轮
Pronunciation examples
UK: Driving is easy, but changing gears is difficult.
US: I drive an automatic, so shifting gears isn't a problem.
- "The brakes and shifters have been stripped off, but the handlebars, frame, and gears appear to be in perfectly good shape."
