当哺乳动物的孩子们在附近时，独有的边缘皮层向家长传递温柔和温暖的感觉，促使哺乳动物去养育后代。
Unique to mammals, the limbic cortex impels creatures to nurture their offspring by delivering feelings of tenderness and warmth to the parent when children are nearby.
其中一些最古老的动物属于哺乳动物，比今天在澳大利亚发现的任何哺乳动物都要大得多。
Some of the oldest belonged to mammals far larger than any found today in Australia.
一根骨头是来自牛一般大小的哺乳动物的肋骨；另一根是来自山羊一般大小的哺乳动物的腿骨碎片。
One bone was a piece of rib from a cow-sized mammal; the other, a leg bone fragment from a mammal the size of a goat.
哺乳动物确实有调节它们体温的能力，但并不是所有哺乳动物都能做到同样的程度，或甚至以同样的方式调节体温。
Mammals do have the ability to regulate their body temperature, but not all can do it to the same degree, or even the same way.
显然，这种逆转录病毒基因填补了哺乳动物生物学的一个小生境，但是从另一方面来说，在第一次感染此类病毒以前，哺乳动物已经能够完美的生殖了。
Clearly, this retroviral gene fills an important niche in mammalian biology, but, on the other hand, mammals were able to reproduce perfectly well before they were first infected.
一方坚持认为：鸟类大脑内部联系的方式和哺乳动物大脑一样，而鸟类和哺乳动物的智力都来自这种大脑内部的联系；
One holds that birds' brains make the same kinds of internal connections as do mammalian brains and that intelligence in both groups arises from these connections.
它们也是地球上最多产的哺乳动物——哺乳动物中五分之一是蝙蝠。
They are also the most abundant mammal on the planet - one in five mammals is a bat.
科学杂志上的报道上称，埋葬地点显示阿拉斯加的古代居民除了觅食大型哺乳动物，也吃鸟类，鱼类和小型哺乳动物。
The burial site shows ancient residents of Alaska foraged for fish, birds and small mammals - as well as large game, reported the journal Science.
这里有个循环论点的例子：,所有的鲸都是哺乳动物，所以所有的鲸都是哺乳动物。
So here's an example of a circular argument: All whales are mammals, therefore all whales are mammals.
科学家先前在探寻为何特定的现存哺乳动物族群会拥有相对大的脑时，多借助于研究关系较为疏远的现存哺乳动物。
Previous research which has looked at why certain groups of living mammals have bigger brains has relied on studies of distantly-related living mammals.
他们把搜索锁定在哺乳动物上，因为哺乳动物的身体跟人类的身体功能非常相似——而且特别把搜索锁定在那些富裕国家里与人共同生活或在人周边生活的哺乳动物上。
They limited their search to mammals, whose bodies work much like humans' do-and, specifically, to those mammals living with or around people in the rich world.
其原理在于，大量的这种真菌意味着当地有大量的哺乳动物粪便，也同时反映了一个大型的哺乳动物群体。
They reasoned that more fungal spores meant more dung, which in turn reflected a larger population of roaming mammals.
而每个哺乳动物族群的生长速度均与其他哺乳动物族群进行了比较，以确定究竟哪些物种的脑发育得更好。
The growth rates of each mammal group were compared with other mammal groups to see what patterns emerged.
人类有68亿人口，不仅是地球上数量最多的大型哺乳动物，而且也是有史以来地球上数量最多的大型哺乳动物。
At 6.8 billion people, the human race is not only the most populous large mammal on Earth but the most populous large mammal that has ever existed.
2011英国哺乳动物报告称，去年，有7种重点保护的哺乳动物物种数量仍在下降，这其中包括一些濒危物种。
Seven species of mammals whose conservation was given priority status, including some of the most endangered, were still declining last year, says the report - State of Britain's mammals 2011.
尽管白垩纪时小行星撞击地球后为哺乳动物搭起了活动的舞台，但是哺乳动物真正大行其道是100万年以后的事情了，也就是在始新世时期。
Though the Cretaceous asteroid cleared the stage, mammals did not really get going until 10m years later, in the Eocene epoch.
之后的五千万年内没有任何新奇的事发生，就在这时，胎盘哺乳动物(或者说是那些有后代存活的哺乳动物)突然之间分化为四种所谓的生物总目。
Nothing much then happened for 50m years when, all of a sudden, the placentals (or, at least, those with surviving descendants) split into four so-called superorders.
研究者们已经发现，在同一种类的各组哺乳动物中，那些生活在气候教温暖的地方的哺乳动物的DNA变化速度更快。
Researchers have found that, among pairs of mammals of the same species, the DNA of those living in warmer climates changes at a faster rate.
一方坚持认为：鸟类大脑内部联系的方式和哺乳动物大脑一样，而鸟类和哺乳动物的智力都来自这种大脑内部的联系；
One holds that birds' brains make the same kinds of internal connections as do mammalian brains and that intelligence in both groups Reinforced Plastics Mortar Pipe from these connections.
哺乳动物肾脏的水保持哺乳动物肾脏的水保存能力表现出关键的陆生适应性。尿离开肾脏之前，水在亨利氏袢中被回收。
The water-conserving ability of the mammalian kidney represents a key terrestrial adaptation, water recovery from the urine before it leaves the kidney takes place in the loop of Henle.
其他方法有助于海洋哺乳动物能比其他种类的哺乳动物更长时间地屏住呼吸。
Other methods help Marine mammals to hold their breath longer than other types of mammals can.
它是漫长而薄相比，肱骨其他哺乳动物，但其关节表面和地区扣押的肌肉，基本上是一样，那些最哺乳动物。
It is long and thin compared to the humerus of other mammals, but its articular surfaces and areas for attachment of muscles are fundamentally like those of most mammals.
他们是否通过使用哺乳动物蛋白和非哺乳动物蛋白的时间不同加以区分，或者还有其他的区分方式？
Do they separate by time the use of mammalian protein vs. non-mammalian proteins, or are there other methods of separation?
除了生活在水中的哺乳动物如海豚、鼠海豚及几种海豹可以使两半大脑轮流处于睡眠和清醒的状态，大多数哺乳动物是不可以半脑睡眠的。
Not as many mammals can sleep unihemispherically; only aquatic mammals such as dolphins, porpoises, and a few species of seal can alternate sleep and wakefulness between the side of the brain.
的主任扬·博尔对全球哺乳动物做出评价说对于一个国际环保组织，很难对哺乳动物做出直接比较和详尽调查。
N. and for Conservation International, an environmental group, said it was hard to draw a direct comparison with the last detailed survey on mammals, in 1996.
的主任扬·博尔对全球哺乳动物做出评价说对于一个国际环保组织，很难对哺乳动物做出直接比较和详尽调查。
N. and for Conservation International, an environmental group, said it was hard to draw a direct comparison with the last detailed survey on mammals, in 1996.
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