If you are interested in something, you think it is important and want to learn more about it or spend time doing it.
I thought she might be interested in Paula's proposal.
我以为她可能会对保拉的提议感兴趣。
I'd be interested to meet her.
我很想与她会面。
An interested party or group of people is affected by or involved in a particular event or situation.
disinterested
The success was only possible because all the interested parties eventually agreed to the idea.
正因有关各方最终的赞成,这一计划才有可能取得成功。
If you say that one person is interested in another person, you mean that the first person would like to have a romantic or sexual relationship with the other person.
I heard there are a lot of guys interested in her.
我听说很多小伙子迷上了她。