求翻译：它在野外主要靠后肢跳跃、奔跑，前肢很少落地，只有吃草时才着地，所以后肢十分健壮，而前肢退化得又短又细，只有后肢六分之一那么大，后肢力量很大，一蹦就能跃过2 米高的障碍物或7 米宽的沟渠。是什么意思？

It depends mainly on the hind legs in the wild, jumping, running, forelimb little ground, and only when the grazing land, so the hind legs are very robust, but thin and short forelimbs degradation was only one-sixth as big hind legs, hind legs with great force, a jump can jump over obstacles or 2 me

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正在翻译，请等待...

It mainly relies on hind legs jumping, running in the wild, the Forelegs have rarely fell to the ground, with only eat grass, so very robust hind and forelimbs degradation is short and fine, only the hind one-sixth is so big, hind limbs strength is large, about obstructions can jump over 2 m or 7 m

It depends mainly on the hind legs in the wild, jumping, running, forelimb little ground, and only when the grazing land, so the hind legs are very robust, but thin and short forelimbs degradation was only one-sixth as big hind legs, hind legs with great force, a jump can jump over obstacles or 2 me