Why horses have skinny legs?

马的腿为什么这么细？

What's the use of a skinny leg?

这么细的腿有何作用？

The answer is Running.

答案是用于奔跑Ftsshj=9F]@]]yb^W。

The skinniest lower legs belong to the fastest runners.

最细长的小腿能够赋予奔跑者最快的速度lXeJ[%]~mQ#.zD。

Think of how a deer can move, as opposed to a tortoise.

相比一只乌龟，想想一只鹿如何运动HMgv3m3#Hf4ugv)。

Why is that?

那是为什么?

It's because when you run, or indeed walk, you are constantly swinging the bottom halves of your legs.

这是因为当你在奔跑,甚至走路时,你的小腿部分要不断进行摆动!VzFQ4f1tK^8Pi。

For humans, one foot is stopped and essentially resting on the ground while the other is moving twice as fast as your overall speed.

对于人类来说,一只脚停止步伐时本质上是在地上,另一只脚则按照你整体速度的2倍进行运动(J@OQeY|~5o4x+*m。