What do two lines of car throttle mean?

We call it the throttle cable, and the force exerted on it is directly transmitted to the throttle return spring.

The other is called the oil return line.

There are two main purposes:

One is to prevent the accelerator line from sticking to the surface rubber due to aging or freezing, which leads to danger. The principle is that it receives the force of the accelerator spring and then transmits it to the accelerator pedal, so this force is a cycle.

Another function is to prevent the throttle bracket.