come to think of it
But after thinking about it carefully, I realized...
口語·非正式·表示突然想到或補充觀點
英文釋義
used to introduce a new thought or realization that was not previously considered
例句
Come to think of it, I left my keys on the kitchen table before we left the house.
典故來源
源自日常對話中突然想起某事時的表達，強調思考后產生的意外或補充性認識。