a bag in a vehicle that automatically fills with air if the vehicle is involved in an accident, in order to protect the driver or a passenger from injury(汽车)安全气囊
In the event of a collision, the airbag stops the driver of the car from hitting his or her chest on the steering wheel.如果发生碰撞事故,安全气囊会防止司机的胸部撞到方向盘上。
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