Something that typifies a particular group of things shows all the characteristics that you would usually expect from it

With his blond, blue-eyed athletic looks, he typifies the all-American boy next door. 他有着典型的美国邻家男孩的形象：金发碧眼和运动型身材。

to be characteristic of something

His latest book reflects the old preoccupations with sex and religion that typify much of his work. 他的新书反映了人们历来对于性和宗教的关注，这也是他大部分作品的特点。