時差N小時:為什么馬的腿很細?(下)

　　Then that foot stops and the other one accelerates.And so on. Thinner, lighter things are easier toaccelerate than heavy, massive ones. So if youwant speed, put the muscles up high and the skinnydown low. Speed If you really want speed, you couldgo even further and pare down the foot, todecrease lower leg mass even more. A few millionyears of evolution and you’ll wind up with…youguessed it. A hoof.

　　然后，一只腳停下來，另一只腳加速。依此類推。更細、更輕的東西比重的、體積大的東西加速快。所以如果你想要速度，上半身肌肉要多些，而下半身要瘦些。想要速度時就加速，你可以走得更遠。縮減腳的尺寸，減少小腿的重量。幾百萬年的進化后，你會停止……你猜對了。進化成一個蹄。

　　accelerate v.使加速; 加快 massive adj. 大而重的 pare down 削減, 減少 lower leg 小腿 wind up 停止