At first I didn't catch on, then I suddenly saw the light.

始而不解, 继而恍然.

《现代汉英综合大词典》

At the hint, he suddenly saw the light.

一经指点, 他恍然不语.

辞典例句

Her joke suddenly clicked.

恍然明白她笑话的含义.

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Liana stood on the doorway silently. She just came round to realise what had happened.

莉安娜静静地站在门口. 她这才恍然觉悟到底发生了什么事.

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That all united should fail to enlighten the competent inquirer in any case is almost inconceivable.

如果把这些情形联系起来,还不能使案件的调查人恍然领悟,那几乎是难以想象的事了.

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I studied the thick Eichmann file in the days that followed and apprehensive.

接下来的日子我仔细研究了艾希曼的文件,并恍然明白了其中的难处.

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