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SSS 2010-07-26

时间:2010-08-05 07:55来源:互联网 提供网友:konicaqq   字体: [ ]
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    (单词翻译:双击或拖选)

You’d think an animal that hops1 would know how to land. But for a kind of frog, that’s not the case. Imagine trying to catch a frog. You reach and they jump, only to land gracefully3 on their feet a few feet away.

It was thought that all frogs moved this way. They'd push off with their back legs, and then once in flight, rotate the limbs forward. Then they landed fore-limbs first. But researchers compared frogs of the family Leiopelmatidae, which still sport an ancient physiology4, to two more modern frog species. Unlike their more graceful2 cousins, the primitive5 frogs kept their back legs straight out after they jumped. So they don’t land on their feet. Instead, they do an ungainly belly6 flop7, and then struggle to get to their feet and jump again. The finding is in the journal Naturwissenschaften.

The scientists say that the back-leg push-off must have evolved first, with the ability to rotate and land softly evolving later. Although the bad landers are still around, their more controlled relatives appear to be better at making longer trips, foraging8 for food and, most importantly, avoiding other animals that have an interest in frog legs—for dinner.

Thanks for the minute for Scientific American’s 60-Second Science. I’m Cynthia Graber


点击收听单词发音收听单词发音  

1 hops a6b9236bf6c7a3dfafdbc0709208acc0     
跳上[下]( hop的第三人称单数 ); 单足蹦跳; 齐足(或双足)跳行; 摘葎草花
参考例句:
  • The sparrow crossed the lawn in a series of hops. 那麻雀一蹦一跳地穿过草坪。
  • It is brewed from malt and hops. 它用麦精和蛇麻草酿成。
2 graceful deHza     
adj.优美的,优雅的;得体的
参考例句:
  • His movements on the parallel bars were very graceful.他的双杠动作可帅了!
  • The ballet dancer is so graceful.芭蕾舞演员的姿态是如此的优美。
3 gracefully KfYxd     
ad.大大方方地;优美地
参考例句:
  • She sank gracefully down onto a cushion at his feet. 她优雅地坐到他脚旁的垫子上。
  • The new coats blouse gracefully above the hip line. 新外套在臀围线上优美地打着褶皱。
4 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。
5 primitive vSwz0     
adj.原始的;简单的;n.原(始)人,原始事物
参考例句:
  • It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
  • His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。
6 belly QyKzLi     
n.肚子,腹部;(像肚子一样)鼓起的部分,膛
参考例句:
  • The boss has a large belly.老板大腹便便。
  • His eyes are bigger than his belly.他眼馋肚饱。
7 flop sjsx2     
n.失败(者),扑通一声;vi.笨重地行动,沉重地落下
参考例句:
  • The fish gave a flop and landed back in the water.鱼扑通一声又跳回水里。
  • The marketing campaign was a flop.The product didn't sell.市场宣传彻底失败,产品卖不出去。
8 foraging 6101d89c0b474e01becb6651ecd4f87f     
v.搜寻(食物),尤指动物觅(食)( forage的现在分词 );(尤指用手)搜寻(东西)
参考例句:
  • They eke out a precarious existence foraging in rubbish dumps. 他们靠在垃圾场捡垃圾维持着朝不保夕的生活。 来自《简明英汉词典》
  • The campers went foraging for wood to make a fire. 露营者去搜寻柴木点火。 来自辞典例句
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