What does throttle mean? Is it a place where air and oil mix? Is the gas-oil mixture controlled by the accelerator pedal?

The so-called throttle is a valve that controls the amount of air entering the engine. The normal throttle should be synchronized with the accelerator pedal, that is, the deeper the accelerator pedal is stepped, the greater the throttle opening will be, and the more air will enter the engine. The air and oil in the old carburetor began to mix at the throttle, which is not the case in most EFI vehicles now. Single-point injection is mixed in throttle valve, multi-point injection is mostly mixed in intake valve, and a small part is directly injected into cylinder.