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SSS 2010-08-11

时间:2010-09-03 03:27来源:互联网 提供网友:yu6707   字体: [ ]
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    (单词翻译:双击或拖选)

There’s nothing like a good steak. And our Australopithecus afarensis ancestors apparently1 felt the same way. Because new discoveries from Ethiopia show that what was likely the species of the famous fossil Lucy used stone tools to butcher meat from big mammals—about 3.4 million years ago. That’s a million years earlier than our best previous evidence for human ancestor stone tool use and meat eating. The finding appears on the cover of the journal Nature.

The research team found two fossil bones with cut and scrape marks, signs of meat carving2. One bone was a piece of rib3 from a cow-sized mammal; the other, a leg bone fragment from a mammal the size of a goat. The bones also had percussion4 marks, sustained while Lucy’s friends smashed the bones to get at the marrow5.

It looks like the ancient tool users collected stones that happened to have shapes conducive6 to butchering, the way kids select particular stones with good potential to skip on water. But future expeditions will look for evidence for any attempts at shaping stones into kitchen utensils7. Because after 3.4 million years, Lucy and her fellow afarensis keep surprising us.

Thanks for the minute. For Scientific American's 60-Second Science, I'm Steve Mirsky.
 


点击收听单词发音收听单词发音  

1 apparently tMmyQ     
adv.显然地;表面上,似乎
参考例句:
  • An apparently blind alley leads suddenly into an open space.山穷水尽,豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
2 carving 5wezxw     
n.雕刻品,雕花
参考例句:
  • All the furniture in the room had much carving.房间里所有的家具上都有许多雕刻。
  • He acquired the craft of wood carving in his native town.他在老家学会了木雕手艺。
3 rib 6Xgxu     
n.肋骨,肋状物
参考例句:
  • He broke a rib when he fell off his horse.他从马上摔下来折断了一根肋骨。
  • He has broken a rib and the doctor has strapped it up.他断了一根肋骨,医生已包扎好了。
4 percussion K3yza     
n.打击乐器;冲突,撞击;震动,音响
参考例句:
  • In an orchestra,people who play percussion instruments sit at the back.在管弦乐队中,演奏打击乐器的人会坐在后面。
  • Percussion of the abdomen is often omitted.腹部叩诊常被省略。
5 marrow M2myE     
n.骨髓;精华;活力
参考例句:
  • It was so cold that he felt frozen to the marrow. 天气太冷了,他感到寒冷刺骨。
  • He was tired to the marrow of his bones.他真是累得筋疲力尽了。
6 conducive hppzk     
adj.有益的,有助的
参考例句:
  • This is a more conducive atmosphere for studying.这样的氛围更有利于学习。
  • Exercise is conducive to good health.体育锻炼有助于增强体质。
7 utensils 69f125dfb1fef9b418c96d1986e7b484     
器具,用具,器皿( utensil的名词复数 ); 器物
参考例句:
  • Formerly most of our household utensils were made of brass. 以前我们家庭用的器皿多数是用黄铜做的。
  • Some utensils were in a state of decay when they were unearthed. 有些器皿在出土时已经残破。
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