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SSS 2009-07-23

时间:2010-05-18 05:39来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific Ameican’s 60-Second Science. I’m Steve Mirsky. Got a minute?

“Would you mind telling me what this is all about, Mister?” No problem, Captain. A study in the Journal of Applied1 Physiology2 shows that artificial gravity should prevent a big problem faced by astronauts who stay weightless for extended periods. “Are you a doctor?” Well, no, but I know the weightlessness problem: muscle decay.

Fifteen healthy men spent three weeks lying in bed. Such inactivity produces similar muscle losses as weightlessness. But eight of the volunteers were spun3 around in a NASA centrifuge 30 times a minute for an hour each day. The forces produced are equivalent to standing4 up in about two and a half times normal gravity. The spun guys kept making leg muscle proteins normally. But muscle production in the unspun group was cut almost in half.

The study has implications for elderly people here on Earth. “I’m 34 years old.” Actually, if today’s 78-year-old Shatner were hospitalized, he’d quickly lose muscle. But getting Bill to stand up and move just a little each day could help him ward5 off muscle decay. “What are we doing here?” “Maybe they’re throwing us a retirement6 party.” “That suits me, I just bought a boat.”

Thanks for the minute, for Scientific Ameican’s 60-Second Science. I’m Steve Mirsky.
 


点击收听单词发音收听单词发音  

1 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • 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。
2 physiology uAfyL     
n.生理学,生理机能
参考例句:
  • He bought a book about physiology.他买了一本生理学方面的书。
  • He was awarded the Nobel Prize for achievements in physiology.他因生理学方面的建树而被授予诺贝尔奖。
3 spun kvjwT     
v.纺,杜撰,急转身
参考例句:
  • His grandmother spun him a yarn at the fire.他奶奶在火炉边给他讲故事。
  • Her skilful fingers spun the wool out to a fine thread.她那灵巧的手指把羊毛纺成了细毛线。
4 standing 2hCzgo     
n.持续,地位;adj.永久的,不动的,直立的,不流动的
参考例句:
  • After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
  • They're standing out against any change in the law.他们坚决反对对法律做任何修改。
5 ward LhbwY     
n.守卫,监护,病房,行政区,由监护人或法院保护的人(尤指儿童);vt.守护,躲开
参考例句:
  • The hospital has a medical ward and a surgical ward.这家医院有内科病房和外科病房。
  • During the evening picnic,I'll carry a torch to ward off the bugs.傍晚野餐时,我要点根火把,抵挡蚊虫。
6 retirement TWoxH     
n.退休,退职
参考例句:
  • She wanted to enjoy her retirement without being beset by financial worries.她想享受退休生活而不必为金钱担忧。
  • I have to put everything away for my retirement.我必须把一切都积蓄起来以便退休后用。
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