I could tell from her expression that something serious had happened.

一看她的脸色我就知道出了很严重的事情。

youdao

I've been so worried that it could be something serious.

我一直很担心会是什么严重的问题。

youdao

That "something serious is afoot" is a description, not an explanation.

“这个严重事件是多么不寻常”只是一个描述，并不是解释。

youdao

"Every time you get something suspicious you go into alarm mode, " fearing that pains and aches could be something serious.

CNN: Edwards: Cancer 'no longer curable'

"The next time I am going to vote Republican if he doesn't do something serious and concrete for immigration reform, " he says.

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"I have a sick son, who has done something serious, " she said.

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