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come to think of it

People say come to think of it to show that they have suddenly realized something.

come to think of it表示某人突然意识到某事

A: Damn it! I forgot my glasses today.

糟糕!我今天忘带眼镜了。

B: Come to think of it, I forgot my glasses too.

话说回来，我也忘带了。