課外班；補習班；額外課程
例句
1.I don't make him do many extra classes.
我沒讓他上許多補習班。
2.So, when they see other children are taking extra classes, they'll be veryanxious.
所以，當他們看到別人的孩子參加課外學習班時，會感到十分擔心焦慮。
3Take at least one extra class each semester.
每學期至少修壹門選修課。