在这期间，一些哺乳动物与一些无飞行能力的大型鸟类对这个世界也有过当家作主的经历，之后它们就灭绝了。
During this time mammals, along with some large flightless birds, did take over. Then they became extinct.
中生代是由恐龙主宰的世界，尽管哺乳动物也在距今2亿年前的化石记录中出现。
The Mesozoic saw the ascendence of dinosaurs, although mammals also appear in the fossil record about 200 million years ago.
海洋哺乳动物专家和世界自然基金会(WWF)相信，现在该地区的北极熊数目在持续增长。
Marine mammal experts and the WWF believe the polar bear population in the region is increasing.
在过去的200年前，这个国家中灭绝的哺乳动物物种比世界上的其他任何地方都要多。
More mammals have become extinct in that country over the last 200 years than in any other place in the world.
看见世界上最危险的哺乳动物之一近在眼前肯定极其兴奋。
To see one of the world’s most dangerous mammal at close must be exciting.
在澳大利亚那一片国土上生活着近百万种动物，其中包括世界上80%的哺乳动物及90%的爬行动物。
Australia is home to nearly one million animal species, including 80 percent of the world's mammals and 90 percent of its reptiles.
海豚是哺乳动物，人们可以在世界上大多数的海洋和淡水中找到它。
They are mammals that can be found in most of the world's oceans, as well as in fresh water.
我是世界上最高的哺乳动物之一！
当我体轻时，我是世界上最小的哺乳动物之一！
When I'm lighter, I am one of the smallest mammals in the world.
这些发现使老挝成为世界上近年来发现了一些全新大型哺乳动物物种的少数几个国家之一。
Such discoveries place Lao PDR among one of the few countries in the world where several entirely new species of large mammals have been found in recent years.
一项关于世界各地热带哺乳动物的大规模调查，利用触发式相机呈现出一系列不可思议的动物生活。
A massive camera trap survey of tropical mammals around the world has returned a magical series of glimpses into animal life.
因其嘴巴的形状而得名的鸭嘴兽是世界上最古老的哺乳动物之一。
The platypus, also known as duckbill for the shape of its mouth, is one of the oldest animals in the world.
报道说，目前，世界上最小的哺乳动物为生活在泰国的一种名为Craseonycteris thonglongyai的蝙蝠，它的长度2.9厘米至3.3厘米。
The smallest known mammal is Kitti's hog-nosed bat, Craseonycteris thonglongyai, from western Thailand, which measures between 2.9cm and 3.3cm long.
作为哺乳动物成功取代他们，他们的栖息地减少了世界各地。
As mammals succeeded in supplanting them, their habitats have been reduced around the globe.
是世界上最小的海洋哺乳动物。
它们是世界上唯一的两种产卵的哺乳动物。
是现在世界上最原始的哺乳动物。
长颈鹿是世界上最高的陆地哺乳动物，可以高达20英尺。
Giraffes are the tallest land mammals in the world, with heads that may tower 20 feet above ground.
古新的世纪， 63成千上万前，是关键的时光在哺乳动物的历史上，它是一个世界没有恐。
The paleocene epoch , 63 millions ago , is a crucial time in the history of mammals , it was a world without dinosaurs.
小鼠是今天世界上供研究用的主要哺乳动物，因为在肿瘤、遗传与神经科学方面的最有前景的突破性进展均依赖于啮齿动物而得以完成。
Mice are the chief research mammals in the world today with some of the most promising cancer, genetic and neuroscience breakthroughs riding on the rodents.
一些最大的脑袋，在世界上的哺乳动物被发现在海洋中。
Some of the largest brains in the world of mammals are found in the oceans.
实际上，他们是世界上最大的挖洞哺乳动物。
鲸是全世界最大的哺乳动物。
以后欧文教授把这一法则引伸到“旧世界”的哺乳动物。
Professor Owen has subsequently extended the same generalization to the mammals of the Old World.
这肯定是最吓人的事了，不过也非常酷。近距离见到世界上最凶猛的哺乳动物一定很令人兴奋。
Must be one of the scariest things you can do, but still incredibly cool. To see one of the world's most dangerous mammal at close must be exciting.
这肯定是最吓人的事了，不过也非常酷。近距离见到世界上最凶猛的哺乳动物一定很令人兴奋。
Must be one of the scariest things you can do, but still incredibly cool. To see one of the world's most dangerous mammal at close must be exciting.
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