That same area is used to push off the ground, generally wearing down this area of the shoe much quicker.

这里也是蹬地的地方，所以鞋的这个面会磨损得更快。

youdao

The more powerfully you can push off the ground, the less effort each stride will take, and ultimately it will be easier to run faster.

蹬地越有力，每步所花的力气就越小，最终将跑得更快。

youdao

An arch in the foot would provide leverage to push off the ground at the start of a stride and then help absorb shock when the foot meets ground again, suggesting Lucy's feet were much like ours.

足部的拱形类似杠杆的作用，在迈步时起到蹬地作用，并且在脚着地时起到吸收冲击力的作用，这暗示露西的脚与我们现代人的很相似。

youdao

Also, while his artificial limbs are lighter than human legs, he must push off the ground harder to get the same thrust, which cancels out any advantage.

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