This is the 3221st most frequent Chinese word.
兴趣
Interest.
Here, "兴趣" (interest) is used to express one's strong enthusiasm or liking towards a particular activity (learning languages).
我对学习语言有很大的兴趣。
I have a great interest in learning languages.
In this sentence, "兴趣" refers to a personal hobby or activity that one enjoys and spends time on.
他的兴趣是收集邮票和旧钱币。
His interest is collecting stamps and old coins.
Here, "兴趣" is used to indicate a feeling of curiosity or attention that is evoked by something (the book's content).