SSS 2008-06-13
时间：2019-01-08 作者：英语课 分类：Scientific American(六)月
This is Scientific American's 60-Second Science, I'm Cynthia Graber. This'll just take a minute.
If evolution weeds out detrimental 1 traits, why do some seem to stick around? Well what's bad in our current environment may have been good in the conditions under which we evolved. New research indicates that even the tendency toward Attention Deficit 2 Hyperactivity Disorder 3 may have been beneficial under the right circumstances. The study was published this week in BioMed Central. Dan Eisenberg is an anthropologist 4 at Northwestern University. He investigated two groups of the same tribe of Kenyans. One group still lives a traditional nomadic 5 life style, and one recently settled in villages. About 20% of individuals in both groups have a genetic 7 mutation 8 that's associated with food cravings and ADHD. Eisenberg collected body mass index and height data of adult males. Those with the ADHD associated gene 6 who were still nomads 9 were better nourished than those without the gene. But those with the gene who'd settled down were less fit. The ADHD related gene may encourage behaviors beneficial for nomads. A boy with this allele might more effectively defend livestock 10 or locate food and water sources. But maybe he wouldn't do so well at farming or sitting in a classroom.
Thanks for the minute for Scientific American's 60-Second Science, and I'm Cynthia Graber.
- We know that heat treatment is detrimental to milk.我们知道加热对牛奶是不利的。
- He wouldn't accept that smoking was detrimental to health.他不相信吸烟有害健康。
- The directors have reported a deficit of 2.5 million dollars.董事们报告赤字为250万美元。
- We have a great deficit this year.我们今年有很大亏损。
- When returning back,he discovered the room to be in disorder.回家后，他发现屋子里乱七八糟。
- It contained a vast number of letters in great disorder.里面七零八落地装着许多信件。
- The lecturer is an anthropologist.这位讲师是人类学家。
- The anthropologist unearthed the skull of an ancient human at the site.人类学家在这个遗址挖掘出那块古人类的颅骨。
- This tribe still live a nomadic life.这个民族仍然过着游牧生活。
- The plowing culture and the nomadic culture are two traditional principal cultures in China.农耕文化与游牧文化是我国传统的两大主体文化。
- A single gene may have many effects.单一基因可能具有很多种效应。
- The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
- It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
- Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
- People who have this mutation need less sleep than others.有这种突变的人需要的睡眠比其他人少。
- So far the discussion has centered entirely around mutation in the strict sense.到目前为止，严格来讲，讨论完全集中于围绕突变问题上。
- For ten years she dwelled among the nomads of North America. 她在北美游牧民中生活了十年。
- Nomads have inhabited this region for thousands of years. 游牧民族在这地区居住已有数千年了。 来自《简明英汉词典》