If so, turn the ignition switch in the on position, put the car in two gear, foot clutch, vehicle drag, when traveling to a certain speed, release the clutch, the car would start.
如果是这样，拧动点火开关在ON的位置，把车挂二挡，脚踩离合，用车拖拽，当行驶到一定速度时，松开离合，汽车就能自然启动。
It can also be a mechanical interlock device that will not let the ignition switch turn to start if the car is in the gear.
同样，安全开关也可以是机械互锁装置，当汽车挂挡后不允许点火开关转到启动位置。
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