She has a lot of class，她有高尚的气质。

a girl with real class.很有风度的姑娘

class最常见的意思就是班级， 年级。

The class were interested in his lecture. 班上学生对他的讲座都很感兴趣。(这里的class代表了全班学生，所以宾语用了复数)

Are you in the second-year class?你是读二年级吗?

class也有（一节）课和课堂的意思。

No talking is allowed during class.上课时不准交谈。

class也可表示阶级。

class contradictions,阶级矛盾。
exploited class，被剥削阶级。
the working class,工人阶级。