suddenly be enlightened; take a tumble; tumble to

1. 我不知道湯姆愛上了瑪麗，但當我看到他看她的神色時，我才恍然大悟。
   I hadn't realized that Tom was in love with Mary, but when I saw how he looked at her the penny finally dropped.
2. 她的笑話使我們一下子恍然大悟，于是我們哈哈大笑。
   Her joke suddenly clicked with us and we all laughed.
3. 我恍然大悟:他一直在撒謊。
   Then the scales fell from my eyes: he had been lying all the time.

恍的英語翻譯：

然的英語翻譯：

大的英語翻譯：

悟的英語翻譯：