变速齿轮放大发动机的转矩，然后通过传动轴将转矩传刭后车轴。汽车的后轮驱动汽车前进，而前轮则只用于掌握方向。

• The gears in the transmission multiply the torque from the engine, and send it back to the rear axle by way of the driveshaft. The rear wheels of the car push it ahead. The front wheels only steer.