SSS 2009-05-29
时间：2018-12-24 作者：英语课 分类：Scientific American(五)月
This is Scientific American’s 60-second Science. I’m Karen Hopkin, This will just take a minute.
Have you ever said, “I know it like the back of my hand”? Well, how well do you know the back of your hand, or the back of your knee, or behind your ears? Probably not as well as scientists at the National Institutes of Health who just completed a survey of the bacteria that live on the skin various parts of the body. They found that different sites harbor different bugs 1, results published in the May 29th issue of the journal Science.
The skin, they pointed 3 out, is a large ecosystem 4 that includes a variety of ecological 5 niches 6. Your moist armpit is like a tropical rainforest, whereas, not far away, your forearm is as smooth and dry as a desert. So the scientists took samples from 20 different body regions in 10 volunteers. And found that the microbes in your armpit are more like those in someone else’s armpit than the ones on your own forearm.
Dry skin showed the greatest diversity with an average of 44 different species found on the forearm. While the least diverse mix, with only 19 species, lives aft of your ears. So science-savvy moms: “don’t worry about washing behind the ears. Instead, bug 2 your brood to give those grubby forearms a good scrubbing.”
Thanks for the minute for Scientific American’s 60-second Science. I’m Karen Hopkin.
- All programs have bugs and need endless refinement. 所有的程序都有漏洞，都需要不断改进。 来自《简明英汉词典》
- The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》
- There is a bug in the system.系统出了故障。
- The bird caught a bug on the fly.那鸟在飞行中捉住了一只昆虫。
- He gave me a very sharp pointed pencil.他给我一支削得非常尖的铅笔。
- She wished to show Mrs.John Dashwood by this pointed invitation to her brother.她想通过对达茨伍德夫人提出直截了当的邀请向她的哥哥表示出来。
- This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
- We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
- The region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
- Each animal has its ecological niche.每种动物都有自己的生态位.