短语词组用作形容詞 (adj.)～+名詞keen edge 鋒利的刀刃keen interest 強烈的興趣～+動詞不定式keen to pass the examination 渴望通過考試keen to visit that city 很想去蓡觀那個城市～+介詞keen about going to the picnic 希望去野餐keen about 〔on〕 music 愛好音樂keen of hearing 聽力敏銳短語 返回 keened