bright as a button
聪明伶俐；机智聪慧
口语·形容人聪明或机灵
英文释义
very intelligent or clever
例句
That little girl is as bright as a button—she learned to read at just three years old.
典故来源
源自19世纪，比喻金属纽扣的光亮，引申为头脑敏锐或反应快。