斑马为何有斑纹-凯发k8官网

斑马为何有斑纹
文章来源:未知 文章作者:enread 发布时间:2023-01-29 08:03 字体: [ ] 
(单词翻译:双击或拖选)
科学家们称他们已经揭开了斑马身上为何有黑白条斑纹的秘密。这篇刊登在《自然生物学期刊上》的文章说斑纹有掩护作用,因为昆虫不喜欢斑纹。
 
there have been many theories to explain the zebra's unmistakable stripes. scientists have suggested that each zebra has a unique pattern that lets other animals recognise it. or that the mass of black and white in a vast 1 provides confusing 2 that puts off 3.
 
but this team set out to test exactly what effect the stripes had on a zebra's most irritating and ubiquitous enemy - the blood-sucking horsefly.
 
as part of their experiment the team put sticky horse models - one white, one black and one zebra-striped - into a fly-infested field. when they collected the flies that had landed and stuck to each of the models, they found that the model zebra attracted by far the fewest flies.
 
the researchers think that zebras had a black-coated ancestor, which evolved its white stripes in an 4 arms race, with an insect that's become the biting, disease-carrying 5 of most horse 6.


点击收听单词发音收听单词发音  

1 pd8zb     
n.兽群,牧群;vt.使集中,把…赶在一起
参考例句:
  • she drove the herd of cattle through the wilderness.她赶着牛群穿过荒野。
  • he had no opinions of his own but simply follow the herd.他从无主见,只是人云亦云。
2 nsnzr     
n./v.掩饰,伪装
参考例句:
  • the white fur of the polar bear is a natural camouflage.北极熊身上的白色的浓密软毛是一种天然的伪装。
  • the animal's markings provide effective camouflage.这种动物身上的斑纹是很有效的伪装。
3 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • the eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
4 ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • life has its own evolutionary process.生命有其自身的进化过程。
  • these are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
5 fd2zj     
n.灾难,祸害;v.蹂躏
参考例句:
  • smallpox was once the scourge of the world.天花曾是世界的大患。
  • the new boss was the scourge of the inefficient.新老板来了以后,不称职的人就遭殃了。
6 0a162615f6eafc3312659a54a8cdac0f     
兽群( herd的名词复数 ); 牧群; 人群; 群众
参考例句:
  • regularly at daybreak they drive their herds to the pasture. 每天天一亮他们就把牲畜赶到草场上去。
  • there we saw herds of cows grazing on the pasture. 我们在那里看到一群群的牛在草地上吃草。
tag标签: animals
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