The classes were very interesting and full of knowledge.

这些课都很有趣也富含知识。

youdao

We all like his classes, for he is always very active and has many ways to make his lessons lively and interesting.

我们都喜欢他的课，因为他总是很活跃，有很多方法使他的课生动有趣。

youdao

Above all, there are many good teachers in our school, so classes are very interesting and lively.

重要的是我们学校有许多优秀的老师，所以课堂生动有趣。

youdao

Now of course, nutrition is the kind of subject that one could spend the whole semester on, could spend--do multiple classes on, because it's a very interesting, fascinating, and complex topic.

当然,要学习营养学这门课程,可能需要整个学期的时间,耗费很多课时,因为这个话题十分有趣,且吸引人,而又一言难尽

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选