时差N小时 为什么马的腿很细?(上)

（单词翻译）

Why horses have skinny legs? What’s the use of a skinny leg? The answer is Running. The skinniest lower legs belong to the fastest runners. Think of how a deer can move, as opposed to a tortoise. Why is that? It’s because when you run, or indeed walk, you are constantly swinging the bottom halves of your legs. For humans, one foot is stopped and essentially¹ resting on the ground while the other is moving twice as fast as your overall speed.

为什么马的腿很细？一个瘦小的腿有什么用？答案是奔跑。最快的奔跑着长着最细的腿属。想想鹿是怎样移动的，它和龟完全不一样。这是为什么？这是因为当你奔跑或行走是，你会不断摆动腿的下半部。对于人类来说，一只脚已停止，实际上是停留在地面上休息，而另只脚正以整体速度的两倍移动。