恍然大悟
[词典] see light suddenly; A light breaks in upon sb.; be a revelation to someone; be suddenly enlightened; take a tumble;
[例句]他们相互看了看，脸上都是同一种表情，恍然大悟、惊讶，而又如释重负。
They turned to one another with the same expression of dawning comprehension, surprise, and relief.
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