Marine mammals generally swim with the current.
海洋哺乳动物一般顺水而游。
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。
松鼠是哺乳动物，对吗？
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？
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。
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。
Hatchlings are really vulnerable, especially to birds and small mammals when they are born.
刚出生的幼体真的很脆弱，尤其是刚出生的鸟类和小型哺乳动物。
When did mammals appear on the earth?
地球上的哺乳动物起源于何时？
Almost all mammals have fur or hair on their bodies.
几乎所有哺乳动物身体外表都长了毛皮或毛发。
The same is true in many other mammals.
不仅人类是这样，许多哺乳动物也是如此。
Did you know that whales are mammals?
您知道鲸鱼是哺乳动物吗？
Only mammals attempt to preserve every life.
只有哺乳动物会试图保护每一条生命。
Winner, "Animal Behavior: Mammals" category.
“动物行为：哺乳动物”组别冠军。
And in fact, this is how it works for all mammals.
事实上，这与哺乳动物相同。
Most mammals sleep for short periods throughout the day.
大多数哺乳动物每天都会小睡一会儿。
That's partly because mammals' teeth preserve really well.
部分原因事因为哺乳动物的牙齿保存的十分完好。
Human differ from other mammals in their ability to speak.
人与其他哺乳动物的不同之处在于人能说话。
Other mammals and human infants rely on brown fat to keep warm.
婴儿，还有其它哺乳动物都靠这种脂肪组织来产热。
When I'm lighter, I am one of the smallest mammals in the world.
当我体轻时，我是世界上最小的哺乳动物之一！
These mammals can stay underwater for six minutes before surfacing.
这种哺乳动物可以在水下停留6分钟，才浮出水面。
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