这本引人入胜的书既有思想性又有知识性。

This intriguing book is both thoughtful and informative.

这本书篇幅太长，但是很有知识性和趣味性。

The book is too long but, nonetheless, informative and entertaining.

他们幽默、精彩的教授使课程既有知识性又不失趣味。

With their humor and excellent teaching, their lessons were filled with both knowledge and fun.

我的谈话具有知识性、教育性也很有趣味，至少我是这么认为的。

My speech was informative, educational, and fun. Or at least I tell myself that.