是鸟?还是恐龙?-凯发k8官网

是鸟?还是恐龙?
文章来源:未知 文章作者:enread 发布时间:2023-01-29 08:10 字体: [ ] 
(单词翻译:双击或拖选)
在中国发现的一块小型恐龙化石标本改变了多年来科学家们对鸟类起源研究的理论。一个半世纪以来,研究人员一直认为始祖鸟是最原始、最古老的鸟类,但最新发现的标本有可能改变这一看法。
 
archaeopteryx has a hallowed place in science, long hailed as not just the first bird but as one of the clearest examples of evolution in action. but in recent years, doubts have arisen as older fossils with similar bird-like features such as feathers and wishbones were discovered.
 
now chinese researchers believe they have finally knocked archaeopteryx off its 1. they've discovered another similar species named xiaotingia which dates back 155 million years to the jurassic era.
 
by carefully analysing and comparing the bony bumps and 2 of this new chicken sized fossil with archaeopteryx, scientists now believe that both are in fact feathery 3 and not birds at all.
 
professor lawrence witmer from ohio university, who has written a commentary on the finding, says the discovery will have huge implications for our understanding of the origins of birds. such are the similarities between these transition species of 4 and birds that scientists involved with this latest finding say that it certainly won't be the end of the argument. further discoveries may change and even restore archaeopteryx to its former glory.


点击收听单词发音收听单词发音  

1 5u1yp     
n.栖木,高位,杆;v.栖息,就位,位于
参考例句:
  • the bird took its perch.鸟停歇在栖木上。
  • little birds perch themselves on the branches.小鸟儿栖歇在树枝上。
2 e2ee808c594bc87414652e71d74585a3     
n.沟( groove的名词复数 );槽;老一套;(某种)音乐节奏v.沟( groove的第三人称单数 );槽;老一套;(某种)音乐节奏
参考例句:
  • wheels leave grooves in a dirt road. 车轮在泥路上留下了凹痕。 来自《简明英汉词典》
  • sliding doors move in grooves. 滑动门在槽沟中移动。 来自《现代汉英综合大词典》
3 87f9c39b9e3f358174d58a584c2727b4     
n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西
参考例句:
  • the brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
  • dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》
4 45053265723f59bd84cf4af2b15def8e     
n.爬行动物,爬虫( reptile的名词复数 )
参考例句:
  • snakes and crocodiles are both reptiles. 蛇和鳄鱼都是爬行动物。 来自《简明英汉词典》
  • birds, reptiles and insects come from eggs. 鸟类、爬虫及昆虫是卵生的。 来自《现代汉英综合大词典》
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