SSS 2009-08-03
时间：2019-01-08 作者：英语课 分类：Scientific American(八)月
People swing their arms when they walk. But did you ever wonder why? Does it help us keep our balance? Is it a relic 1 from our evolutionary 2 past? Is it because we look like doofuses if we don’t? Now, a report in the Royal Society journal Biological Sciences suggests that we swing our arms while walking, in part, because it takes less energy than it would to stop.
Since people don’t walk on all fours, it’s not clear why we pump our arms when we pick up our feet. And studies have shown that it does require some muscle to do it—those limbs don’t just sway passively like a pendulum 3. So there must be some benefit.
To find out, scientists studied walking robots and human volunteers, who walked normally or with their hands secured to their sides. And they found that for people on-the-go, strolling with their arms strapped 4 down took 12 percent more energy than just letting them fly. Swinging the arms also offsets 5 the scissoring of the legs, saving even more energy. So next time you go for a walk, don’t forget those arms. ‘Cause it don’t mean a thing if it ain’t got that swing.
- This stone axe is a relic of ancient times.这石斧是古代的遗物。
- He found himself thinking of the man as a relic from the past.他把这个男人看成是过去时代的人物。
- Life has its own evolutionary process.生命有其自身的进化过程。
- These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
- The pendulum swung slowly to and fro.钟摆在慢慢地来回摆动。
- He accidentally found that the desk clock did not swing its pendulum.他无意中发现座钟不摇摆了。
- Make sure that the child is strapped tightly into the buggy. 一定要把孩子牢牢地拴在婴儿车上。 来自《简明英汉词典》
- The soldiers' great coats were strapped on their packs. 战士们的厚大衣扎捆在背包上。 来自《简明英汉词典》
- The following paragraphs deal with intra-source offsets and the so-called \"bubble\" concept. 下面讨论污染源内部的补偿和所谓的“泡泡”概念。 来自英汉非文学 - 环境法 - 环境法
- The preceding paragraphs were concerned with inter-source offsets. 前文牵涉到污染源之间的补偿。 来自英汉非文学 - 环境法 - 环境法