他突然转动了点火开关的钥匙，发动了引擎。

Abruptly he turned the ignition key and started the engine.

《柯林斯英汉双解大词典》

他笨拙地把钥匙插进汽车点火开关。

He fumbled the key into the ignition.

《牛津词典》

转动点火钥匙，弹簧的压力使“开启”位置变为“启动”位置，起动接触器闭合，使得起动电机线圈或磁性开关与电池接通。

When the ignition key is turned against spring pressure past the on position to start, the starting contacts close. This connects the cranking-motor solenoid or magnetic switch to the Battery.

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