英汉词典

1. 渴望的；热切的；热衷的
    If you are keen on doing something, you very much want to do it. If you are keen that something should happen, you very much want it to happen.

keen的近义词

    e.g. You're not keen on going, are you?...
           你不太想去，是吗？
    e.g. Both companies were keen on a merger...
           两家公司都很想合并。