I burst out laughing, but then realized he wasn't joking.

我大笑了起来，然后意识到他并非在开玩笑。

youdao

They thought at first that the star was young — only a few million years old — but then realized that it was billions of years old, like our sun.

他们开始认为这个行星是很年轻-仅仅数百万年-但是而后却意识到它像太阳那样已经存在数十亿年了。

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This week I had 4 different thoughts that I wanted to discuss and couldn't decide which one to choose, but then realized that they were actually all connected.

这周我本来有四个不同的想法想要讨论，我也不能决定要选择哪个，但后来我意识到这些想法是互相联系的。 这个联系就在于我的家人这周前几天看的一部电影的名字。

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But she realized then that his mind would forever be on the march, always requiring something newer, better and more perfect.

VOA: special.2009.09.26

I don't know about that. I am not so sure." But then, we realized that like when we walk out that door, it's the whole world again. So you get sucked up by your group, by your sort of identity.

我不知道，不是很确定，然后呢，我们就意识到走出那个大门，又是一个完整的世界，所以你就会,被你的团体，你的身份所束缚。

普林斯顿公开课 - 人性课程节选

But then, I realized it was inevitable that I had to use it

之后才意识到，使用这个是不可避免的。

便利的社交媒体 - SpeakingMax英语口语达人

He drove the thing back to Minnesota in a U-Haul, but then realized part of it was too big to get into his building.

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But then I realized that a blog, by definition, is inherently self-indulgent, is it not?

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But then Jacob realized one of the doors in the room wasn't locked.

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