There's a huge variety of classes, meaning you're sure to find something at your level.

课程种类繁多，这意味着你一定能找到适合自己水平的课程。

In American schools, you can " add" (add) a class, meaning you can decide to take a class or you can drop a class.

在美国学校， 你可以“加” （add）一门课，意思是你可以决定上一门课， 也可以放弃一门课。