If you don't think something will happen and then it happens, you will feel surprised.

如果你认为某事不会发生，然后它发生了，你就会感到惊讶。

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And then it happens.

然后它发生了。

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And then it happens. The dream becomes real.

然后就发生了。梦想成为现实。

youdao

If anything happens to me in my livelihood, then it's spread out over everybody and everybody means the whole world.

如果我的生计出问题了，它将分散到每个人身上,每个人指全世界的人。

耶鲁公开课 - 金融市场课程节选

I am going to do it first pictorially and then I will write the algebra. What happens here?

下来我会做绘画工作,并写下一些代数，这儿怎么了？

麻省理工公开课 - 固态化学导论课程节选

In other words what happens to people's health as they lose weight and then regain it repeatedly over a period time?

换言之,在一段时期内反复增重减重,对人们的健康有什么影响

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Then it happens and confusion reigns.

FORBES: When Does Optimism Pay Out The Most?

But then when it happens repeatedly it starts to get to you.

CNN: Interview with Abhishek Bachchan

U.S. Swimming pushed for the Chinese to be banned, but then when it happens to one of their own, they can't stand up for what they believe in.

CNN: Double Standard