n.齿轮( gear的名词复数 );装备;挡;(做某事的)速度;
例句:
If the cogs don't mesh correctly, the gears will keep slipping.
如果嵌齿不能完好啮合,齿轮就会脱落。
He ground the gears on the car.
他把汽车排挡踩得嘎嘎作响。
Gears on an automobile may be used either to decrease or increase speed.
汽车的排挡可用来加速或减速。