而曲轴，在齿轮箱挂挡时，又使汽车持续运动。
When the gears are engaged, the crankshaft keeps the car moving.
安全开关可以是一种电子开关，当汽车挂挡后，它断开控制电路。
The safety switch can be an electrical switch that opens the control circuit if the car is in gear.
不久前一个朋友找到我，问我为什么新买的车子突然不好挂挡了。
Not long ago, a friend found me and asked me why the new car to buy bad Guadang of a sudden.
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