The newest era is called Cenozoic beginning at 65 million years ago. It is the ageofMammals.
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。
2
We talk about the ageof dinosaurs or the ageofmammals, 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。
3
You probably remember that human infants are less developed physically than other mammalsof the same age.