Marine mammals generally swim with the current.
海洋哺乳动物一般顺水而游。
Carnivores are usually socially complex mammals.
食肉动物通常是有着复杂的社会关系的哺乳动物。
Only about five percent of mammals are monogamous.
只有约百分之五的哺乳动物是单一配偶的。
It has been suggested that mammals took over from dinosaurs 65 million years ago.
有人提出哺乳动物是在6 500万年前取代恐龙的。
Humans experience a delayed maturity; we arrive at all stages of life later than other mammals.
人类经历着一个迟来的成熟；我们进入生命各个阶段的时间比其他哺乳动物要晚。
松鼠是哺乳动物，对吗？
猴子和狗都是哺乳动物。
Most mammals walk on their toes.
大多数哺乳动物用脚趾走路。
I am very interested in mammals.
我对哺乳动物很感兴趣。
鲸鱼是一种哺乳类动物。
Whales are not fish, but mammals.
鲸不是鱼类，而是哺乳类植物。
大多数哺乳动物生活在陆地上。
Most mammals have reached this point.
很多哺乳动物已经到达这一点。
We learned about mammals in class today.
我们今天在课堂上学了有关哺乳动物的知识。
Whales are mammals that live in the sea.
鲸是生活在海洋中的哺乳动物。
When did the mammals appear at the earth?
哺乳动物是什么时候出现在地球上的？
Cats, dogs, and monkeys are some mammals.
猫、狗和猴子都是哺乳动物。
Mammals are born alive from their mothers.
哺乳动物是从母体中分娩出来的。
Not all large mammals died out at that time.
并不是所有的大型哺乳动物都在那个时期灭绝了。
Pythons mainly feed on birds and small mammals.
蟒主要吃鸟和小的哺乳动物。
Some examples of mammals are man, pigs, and dogs.
哺乳类动物的例子有人类，猪和狗。
This is more typical of mammals than of reptiles.
相比于爬行动物，哺乳动物的这一特性更加典型。
For small mammals, microclimates can make a big difference.
对于小型哺乳动物来说，微气候可以产生很大的影响。
Unlike many mammals they do not engage in human-like behaviour.
与许多哺乳动物不同的是，它们不会做出类似人类的行为。
We know that mammals, dogs for example, dogs vocalize many different sounds.
我们知道像狗这样的哺乳动物会发出很多不同的声音。
Some of those small mammals help to sustain such big birds as golden eagles.
其中的一些小型哺乳动物有助于维持金鹰等大型鸟类的生存。
Pakicetus probably detected sound through the ear opening as in land mammals.
巴基鲸可能是通过像陆地哺乳动物一样的耳朵的开口来探测声音。
In that sense, they are closer to mammals' brains than other reptiles' brains.
从那种意义上来说，比起其他爬行动物的大脑它们更接近哺乳动物的大脑。
It is probable that the nocturnal trades a way back in the ancestry of all mammals.
这种夜间的“交易”也许可以一直追溯到所有哺乳动物的祖先身上。
Seasonal migration is another form of escape, especially for large mammals or birds.
季节性迁徙是另一种逃避方式，特别是对大型哺乳动物或鸟类来说尤为如此。
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