He thought he had a nightmare.

他以为自己做了个噩梦。

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I had a nightmare last night.

昨晚我做了一个噩梦。

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Joruji Shinozaki wrote on the VOA Learning English page on Facebook: Friday's earthquake was a nightmare.

VOA: special.2011.03.12

When I do my best to imagine some kind of existence that would be desirable or attractive forever, it just doesn't work. It becomes a nightmare.

当我尽力想象一种,令人永远期望迷恋的存在时，根本想象不出，总是变成恶梦。

耶鲁公开课 - 死亡课程节选

It would actually be a nightmare, something you would long to free yourself from.

其实它将是场恶梦，那将是你渴望摆脱的东西。

耶鲁公开课 - 死亡课程节选

With the market value plummeting, he argued, mark-to-market accounting turned AIG's balance sheet into a nightmare.

NPR: Firms Blame Financial Woes On Accounting Rule

British Conservatives may complain that the single-market project has turned into a nightmare of re-regulation.

ECONOMIST: Charlemagne

But the half-empty marina has turned out to be a bit of a nightmare for Stockton.

BBC: Debt and defiance in bankrupt Stockton, California