人情世故

He felt people were contemptuous of his lack of sophistication.

他觉人们看起他人情世故。

She is unschooled in the way of the world.

她人情世故；她世态炎凉。

He's very young and inexperienced, and doesn't know about the ways of the world.

他还年轻, 又缺乏经验, 人情世故。