例子：
1.兴趣;关注;爱好
I developed an interest in the machine.
我对这机器发生了兴趣.
I have lost my interest in chemistry.
我对化学已不感兴趣.
2. 趣味性(+to)
Local color added interest to the novel.
地方色彩增加了这部小说的吸引力.
3. 感兴趣的事物或人（这是就可数）
His two great interests in life are music and painting.