時(shí)差N小時(shí):為什么馬的腿很細(xì)?(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.

　　為什么馬的腿很細(xì)?一個(gè)瘦小的腿有什么用?答案是奔跑。最快的奔跑著長(zhǎng)著最細(xì)的腿屬。想想鹿是怎樣移動(dòng)的，它和龜完全不一樣。這是為什么?這是因?yàn)楫?dāng)你奔跑或行走是，你會(huì)不斷擺動(dòng)腿的下半部。對(duì)于人類來說，一只腳已停止，實(shí)際上是停留在地面上休息，而另只腳正以整體速度的兩倍移動(dòng)。

　　skinny adj. 皮包骨頭的, 很瘦的 tortoise n. 龜, 行動(dòng)遲緩的人 essentially adv. 實(shí)質(zhì)上 overall adj. 從頭到尾的; 總的