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SSS 2008-05-27

时间:2010-05-14 01:38来源:互联网 提供网友:0922013129   字体: [ ]
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This is Scientific American's 60-Second Science. I am Adam Hamterture, got a minute?

What's sixteen feet tall and 9,550 years old? It’s the world's oldest tree. The worn and weathered spruce grows in Sweden's windswept tundra1. But, until recently, well, recent to the tree at least, it barely resembled a tree at all. Before this last warm century, the spruce grew more like a shrub2 to survive the harsh conditions of its cold landscape. But rising temperatures convinced the tree to give up its shabby lifestyle, shed the majority of its needles and go with the single-trunk look.Researchers from Sweden's Umea University found the tree growing amid the remains3 of four generations of spruce dating from 375 to well over 9,000 years old. Spruce trees can clone themselves by sending new trees up through the ground from established roots. When the scientists tested the current tree, they found it was genetically4 identical with the remains of all four previous generations. Researchers are excited about having a 10,000-year-long case study of how past climate changes affected5 plant growth and productivity. It’s a finding sure to spruce up all of botany.

Thanks for the minute for Scientific American's 60-Second Science. I am Adam Hamterture.


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1 tundra dmtwW     
n.苔原,冻土地带
参考例句:
  • The arctic tundra is at the top of the world around the North Pole.北极冻原是指北极点周边的地区,是世界最高的地方。
  • There is a large amount of methane gas under the Siberian tundra.西伯利亚的冻土地带之下有大量的甲烷气体。
2 shrub 7ysw5     
n.灌木,灌木丛
参考例句:
  • There is a small evergreen shrub on the hillside.山腰上有一小块常绿灌木丛。
  • Moving a shrub is best done in early spring.移植灌木最好是在初春的时候。
3 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
4 genetically Lgixo     
adv.遗传上
参考例句:
  • All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
  • Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物
5 affected TzUzg0     
adj.不自然的,假装的
参考例句:
  • She showed an affected interest in our subject.她假装对我们的课题感到兴趣。
  • His manners are affected.他的态度不自然。
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