And exactly in the middle of the ball’s motion -- at the equilibrium point -- its potential energy goes down to 0.

恰好在球运动的中间——在平衡点——它的势能下降到 0。

And exactly in the middle of the ball's motion -- at the equilibrium point -- its potential energy goes down to 0.

并且正好在球运动路径的中间——在 平衡点 - 没有势能。

However, if the heavier body is massive enough — like it is in Sun-Earth set — then the relevant forces will always return objects to these equilibrium points, making them our most stable parking spots.

但是，如果较重的物体足够大，如太阳、地球这组天体，那么这些力会使物体待在平衡点，使它们成为最稳定的停车点。