Many million years ago the territory of the present Perm region was occupied by the Perm Sea.
现在的彼尔姆地区在数百万年前还属于彼尔姆海。
Many experts think the common ancestor lived at least 7 million years ago.
许多专家认为这个共同的祖先至少在700万年前就存在了。
Since metals, including zinc and copper, form part of many animals' diets, so mapping them in fossils could shed light on what the animals fed on 100 million years ago.
包括锌和铜在内的金属，是动物的食物的组成成分，所以标记它们在化石中的分布和含量，可以让我们了解1亿年前这种动物的饮食习惯。
Many scientists believe that -more than 60 million years ago -an asteroid six miles wide struck in Mexico's Yucatan and triggered the end of the dinosaurs.
很多科学家都相信——6000万年前，一颗6英里宽的小行星撞击了墨西哥尤卡坦半岛，终结了恐龙时代。
Many scientists believe that - more than 60 million years ago - an asteroid six miles wide struck in Mexico's Yucatan and triggered the end of the dinosaurs.
很多科学家都相信——6000万年前，一颗6英里宽的小行星撞击了墨西哥尤卡坦半岛，终结了恐龙时代。
Until now, many researchers suspected that such a gait did not appear at least until the appearance of early Homo species around 2.5 million years ago.
迄今为止，许多研究人员仍然怀疑，这样的步态至少要到大约250万年前出现早期Homo类人物种时才具备。
The earliest of the Big Five, the end-Ordovician or Ordovician-Silurian extinction events some 444 million years ago, are reckoned by many to be the second largest.
五次大灭绝中发生最早的一次是奥陶纪末期或者奥陶纪-志留纪大灭绝事件，发生在大约4亿4千4百万年前。许多科学家估计这次规模是五次当中第二大的。
About 65 million years ago, most of the dinosaurs and many other animals and plants were wiped off Earth, probably due to an asteroid hitting our planet.
大概六千五百万年前，大部分恐龙和许多其它的动植物在地球上灭绝了，可能是因为小行星撞击了地球。
By contrast, Scandinavians, Dutch and Germans like to live alone: 40 percent of all Swedes live alone, as do seven million Britons - three times as many as 40 years ago.
与此相反，斯堪的纳维亚人、荷兰人和德国人喜欢独自生活：40%的瑞典人独自生活，七百万英国人独自生活——这是40年前的3倍。
By contrast, Scandinavians, Dutch and Germans like to live alone: 40 percent of all Swedes live alone, as do seven million Britons - three times as many as 40 years ago.
与此相反，斯堪的纳维亚人、荷兰人和德国人喜欢独自生活：40%的瑞典人独自生活，七百万英国人独自生活——这是40年前的3倍。
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