The crank shaft rotates, the crank shaft goes to the transmission.

曲轴旋转，曲轴进入变速箱。

So as piston is forcing down pressure on the connecting rod, which is forcing pressure onto the crank shaft, you're applying torque right here.

因此活塞给连杆施加向下的压力，从而往曲轴上施力，你在这里施加扭矩。

So going back to the four strokes of the motor, the piston is forced down, as the piston is forced down, it's forced down on a crank shaft.

说回到四冲程电机，活塞被向下推，当活塞被向下推时，它被压在曲轴上。

Now a supercharger really is the same concept, it's pressurizing the motor, it's forcing air and fuel into the motor, but it uses a belt and a crank off the crank shafts.

增压器实际上是相同的概念，就是给电机加压，它迫使空气和燃料进入电机，但它使用皮带和曲轴上的曲柄。