What are the two small air intakes A and E of modern throttle?

Theoretically, when you don't step on the gas pedal, the gas pedal should be closed. But there is also a premise that the car needs to inhale when it is idling, and a small hole can already meet the intake volume, so leaving a hole on the throttle is the EFI car. The carburetor should idle with an idle screw.

Throttle is a controllable valve that controls air to enter the engine. There are two kinds: traditional cable throttle and electronic throttle. After the gas enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work.