时差N小时:为什么马的腿很细?(上)

　　Why horses have skinny legs? What’s the use of askinny leg? The answer is Running. The skinniestlower legs belong to the fastest runners. Think ofhow a deer can move, as opposed to a tortoise.Why is that? It’s because when you run, or indeedwalk, you are constantly swinging the bottomhalves of your legs. For humans, one foot is stoppedand essentially resting on the ground while theother 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。

　　skinny adj. 皮包骨头的, 很瘦的 tortoise n. 龟, 行动迟缓的人 essentially adv. 实质上 overall adj. 从头到尾的; 总的