I made a terrible mistake.

我犯了一个很大的错误。

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Huck had made another terrible mistake!

哈克又犯了一个可怕的错误！

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America's almost complete dependence on automobiles has been a terrible mistake.

美国几乎完全依赖汽车的做法是一个严重的错误。

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But she says they believe it would be a terrible mistake not to use these influential tools to contribute to the answers.

VOA: special.2009.11.27

But that is a terrible mistake because we should know that sculptresses are very rare; very few people have the job of a sculptress or sculptor, so it's a mistake.

但这是严重错误,我们都很清楚,雕刻家是很罕见的职业,只有很少人会是雕刻家,所以这是错的

耶鲁公开课 - 金融市场课程节选

It would either say something like -I'm not going to do the words that they would have come up with, but they would have said, yeah that's a good place to go or don't do that, that's a terrible mistake.

这答案不外乎两种,我不会说他们的那种语言,但是他们的意思大概是,那是个好去处,或者别做那事儿,那是个糟糕的错误

耶鲁公开课 - 古希腊历史简介课程节选

After the case against Halliwell collapsed she said "somebody has made a terrible mistake".

BBC: Becky Godden's father angry at police for arrest mistake

They are angry after being lied to about the Iraq war, which they recognize was terrible mistake.

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"He made a terrible mistake in having these files on his computer and going to China, " Tunick said.

WSJ: 5-plus years for Ill. man in military secrets case