The horse won't leave, Ziwei.

Because the seesaw needs two people to play, it corresponds to "one horse rides two people". When playing the seesaw, when one person weighs heavily and exerts downward force, the seesaw will appear in an alternating state, and the position of the seesaw is fixed, corresponding to "I want to be high and I will be low, although the horse does not walk", so the answer is the seesaw.