1 keen (to do sth/that...) very interested in sth; wanting to do sth 热心的: They are both keen gardeners. 他们两人都很热衷于园艺。I failed the first time but I'm keen to try again. 我头一次失败了，可是我很想再试一次。She was keen that we should all be there. 她很希望我们都去那里。

2 (used about one of the senses, a feeling, etc) good or strong （指官能、感觉等）敏锐的，灵敏的: Foxes have a keen sense of smell. 狐狸的嗅觉很灵敏。