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(单词翻译:双击或拖选)
Birds are sometimes referred to as glorified1 reptiles3, and even though modern birds are structurally4 very different from reptiles.Some show minor5 evidence of their ancestry6, like scales on their feet, or claw on their toes. However, flying reptiles disappeared more than 70 million years ago, but birds have obviously managed to survive. You remember that biological success of any group of organism is measured by the number of species and individuals in the group. There are distributions through all around the world and of course their ability to adapt to all kinds of environmental conditions. On the basis of these criteria7, birds are considered as one of most successful vertebrate in modern times. Their success means they were probably not only better adapted than reptiles for flying, but also for life on land and water. But when did glorification8 begin? And how fast did the changes occur? It was seen logical to assume that at some time millions of years ago transitional stages between reptiles and birds existed. And in fact, one of the most important clues came with the discovery of the fossils called archaeopteryx which literally9 means ancient bird.The archaeopteryx dates back 150 million years to the Jurassic period. Fortunately, the fossils are not only included the skeleton, but also impression of the feathers of the wings and double rare tails feathers. If it were not for these feathers, scientists would have classified it as the reptile2 because it have many characteristics more like a lizard10 than a bird. Archaeopteryx is not, however, considered as the ancestor of modern birds. But it probably was deprived from ancestral form that also gave rise to modern birds.Up until the mid-1980s,archaeopteryx was considered the most ancient of all birds. Then in 1986, a fossil was discovered called protoavis that show a mixture of dinosaur11 and bird-like characteristics. But it lived 225 million years ago, about 75 million years before archaeopteryx. So clearly the final work is not yet in on the origin of birds.
1 glorified | |
美其名的,变荣耀的 | |
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2 reptile | |
n.爬行动物;两栖动物 | |
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3 reptiles | |
n.爬行动物,爬虫( reptile的名词复数 ) | |
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4 structurally | |
在结构上 | |
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5 minor | |
adj.较小(少)的,较次要的;n.辅修学科;vi.辅修 | |
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6 ancestry | |
n.祖先,家世 | |
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7 criteria | |
n.标准 | |
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8 glorification | |
n.赞颂 | |
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9 literally | |
adv.照字面意义,逐字地;确实 | |
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10 lizard | |
n.蜥蜴,壁虎 | |
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11 dinosaur | |
n.恐龙 | |
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