SSS 2009-07-29
时间：2018-12-24 作者：英语课 分类：Scientific American(七)月
When Michael Phelps is out of the water, he towers over mere 1 non-Olympic mortals. Then he slips into the pool, and makes record-breaking speed seem effortless. His height, it turns out, is no accident. According to research published in The Journal of Experimental Biology, winning athletes are getting taller, more slender, and yet heavier in comparison to the normal population.
Since 1900, the average person’s height has gone up by about two inches. But winning swimmers are four and a half inches taller than their old-time counterparts.
Researchers applied 2 mathematical models of animal locomotion 3 to show why height gives them a competitive advantage. Coaches have said in the past that swimmers should lift their bodies out of the water because air has less drag. But researchers showed that larger bodies fall faster and more forward in the water and create a larger wave that helps push them ahead.
The authors suggest that in the future we might need weight classes for all sorts of sports, not just boxing or wrestling. That might give one of the shorter guys a chance to win an Olympic swimming event even with Michael Phelps in the race.
- That is a mere repetition of what you said before.那不过是重复了你以前讲的话。
- It's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。
- She plans to take a course in applied linguistics.她打算学习应用语言学课程。
- This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
- By land,air or sea,birds are masters of locomotion.无论是通过陆地，飞越空中还是穿过海洋，鸟应算是运动能手了。
- Food sources also elicit oriented locomotion and recognition behavior patterns in most insects.食物源也引诱大多数昆虫定向迁移和识别行为。