The newest era is called Cenozoic beginning at 65 million years ago. It is the age of Mammals.
最新的一个代叫做新生代，它是从距今6500万年的时候开始的，这个时期是哺乳动物的时代。
We talk about the age of dinosaurs or the age of mammals, but since the first animal climbed onto land, every age has been, by any reasonable measure, the age of insects too.
我们也许还在津津乐道于恐龙时代或哺乳动物时代，但殊不知第一只动物爬上陆地时，昆虫的时代也已然来临。
You probably remember that human infants are less developed physically than other mammals of the same age.
你可能还记得，同龄人类婴儿的身体发育不如其他哺乳动物。
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