評論
打印
Did you ever have a broken leg?
你曾經有過一條腿骨折嗎？
Or did you ever see someone else in a cast?
或是你曾經看到過別人腿上裹著石膏嗎？
If so, you may have noticed something odd whenthe crutchescome out.
如果有的話，你會發現拄著拐杖時，會有奇怪的事發生。
You would think that person would be the slowest in the crowd,just hobbling along.
你會認為那個拄著拐杖的人應該是人群中走得最慢的，因為他們步履蹣跚。
But that is not so.
但事實并非如此。
Once someone becomes comfortable moving around on crutches, they can often move very quickly, even outpacing uninjured folks.
當一個人習慣了用拐杖走路以后，他們就可以移動的很快，甚至超過沒有受傷的人。
What's going onhere?
這是為什么呢？
The answer is found in the dynamics of walking. Ask yourself the following question:
我們可以在走路的動力學中發現答案。問問你自己以下問題：
who can walkfaster, a ballet dancer whose leg muscles are extremely fit, or a couch potato whose legs aresoft and flabby?
誰可以走得更快？是腿部肌肉非常健壯的芭蕾舞演員，還是腿部柔軟松弛，整天坐著看電視的人？
We're not talking about running now, just about walking.
我們不是說跑步，只是走路。
The answer? Whichever one is taller.
答案是？誰更高就走得更快。
Yep. Leaving aside issues such as weak knees and just speaking in general, muscular ability doesnot determine walking speed.
是的。撇開膝關節疲軟不說，就一般來講的話，肌肉的能力并不能決定走路的速度，
It's the length of the leg that does it.
但腿的長度可以。
Little children have to run tokeep pace with a walking adult not because their muscles are weak but because their legs areshort.
小孩子要跑步才能跟上大人的步伐，并不是因為他們的肌肉不夠發達，而是他們的腿太短了。
Now, let's think about the person with the broken leg.
現在我們來看看骨折的腿。
True, one leg is out of commission and there's the extra weight of the cast.
的確，一條腿不能發揮作用了，并且還有額外石膏的重量。
But if you watch a person on crutches walk, you'll notice thatthey keep both legs together with their torso and pivot from the shoulder.
但是如果你看到一個人拄著拐杖走路，你會發現他們的雙腿總是與身體和肩部的支點保持一致的。
The body swings forward as the crutches lean back, and vice versa.
當拐杖向后靠時身體就向前擺動，反之亦然。
That way they canmove as if the majority of their body were two gigantic legs.
這就是為什么他們可以走動，因為他們大部份的身體就像兩條巨大的腿。
Their stride effectively becomes thatof someone about twice their actual height.
他們走路的速度可以和比他們高兩倍的人相提并論。
