Again in the case of all motor vehicles, friction is essential in the operation of the brake.
Again in the case of all motor vehicles, friction is essential in the operation of the brake.
还有，所有机动车辆的制动器工作时都需要摩擦。
Again in the case of all motor vehicles, friction is essential in the operation of the brake.
还有，所有机动车辆的制动器工作时都需要摩擦。