translation.en: They're tuned such that they easily collapse in one direction to pull the leg out from debris, but they're stiff in the other direction so they capture disparities in the surface.
translation.zh: 它们的构造使得它们都很容易向一个方向倒 把一条腿从碎片中拔出， 这些毛很硬，不会弯向另一个方向，因此可以对付不同的表面。