bright as a button
聰明伶俐；機智聰慧
口語·形容人聰明或機靈
英文釋義
very intelligent or clever
例句
That little girl is as bright as a button—she learned to read at just three years old.
典故來源
源自19世紀，比喻金屬紐扣的光亮，引申為頭腦敏銳或反應快。