1、interest 表示“泛泛的兴趣”时不可数，如 I find no interest in such things. 我对这些不感兴趣。

2、 表示“具体的兴趣”“爱好的事物”“嗜好”时可数，如 His two great interests in life are music and painting. 他一生中的两大爱好是音乐和绘画。

3、 Eating seems to be his only interest in life. 吃似乎是他生活中唯一的爱好。

4、参考文献：金山词霸。