发动机启动了，车加大油门冲下了山坡。
The engine started, revved, and the car jerked away down the hill.
司机一挂上挡，踩下油门踏板，发动机就重新启动了。
As soon as the driver puts the car in gear and touches the gas pedal, the engine starts back up.
这些设备可控制安全气囊的开启，记录汽车的速度、刹车或油门是否启动、是否系安全带。
These devices tell the airbags when to deploy, but they also record the car's speed, whether the brake or gas pedal was engaged, and if seat belts were fastened.
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