So that would be my guess, but nobody knows for sure.

这是我的猜测,没人能确定

耶鲁公开课 - 古希腊历史简介课程节选

Nobody knows, but there's a theory which won't answer your question but will put it into a broader context.

没有人知道答案,但有这么个理论,它无法回答你的问题,但却能让你从更宽广的视角来看这个问题

耶鲁公开课 - 心理学导论课程节选

Nobody knows how bad the mortgage crisis is going to get but Ben Bernanke thinks that it's so important that we prevent a collapse that we should take that risk.

没有人知道抵押危机,到底会有多坏的影响，但是本？伯南克认为,预防承担那个风险所带来的暴跌,是非常重要的。

耶鲁公开课 - 金融市场课程节选