cǎi / xià / yóu / mén / hòu / jié / qì / mén / huì / kòng / zhì / jìn / rù / fā / dòng / jī / de / kōng / qì踩下油门后,节气门会控制进入发动机的空气。After the accelerator is pressed, the throttle controls the air entering the engine.