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- How it happened is unclear; a judicial inquiry has begun. 具体是怎样的情况还不清楚，司法调查已经开始进行。
- Why brood on how it happened? The thing to do is to put it right. 干吗要老去想那件事是怎么发生的?改正就好了。
- The police asked me to describe exactly how it happened. 警察让我描述一下这事是怎样发生的。
- But exactly why this should happen is unclear. 但到底为什么会发生这种事情，人们还不清楚。
- We never knew for certain how it happened. 究竟是怎么发生的，我们始终未搞清楚。
- We could not ascertain how it happened. 我们没能弄清它是怎样发生的。
- I can quite see how it happened. 我知道是怎样引起的。
- I don't even know how it happened. 我也不知道是怎么发生的。
- We are puzzled as to how it happened. 关于它是如何发生的，我们很迷惑
- Woo,that's really cool,and that's how it happened. 哇，这太酷了。 这就是它的由来。
- When it happened is immaterial; I want to know why it happened. 发生在什么时候并不重要，我要知道的是为什么会发生这种事。
- We could not ascertain how it happened . 我们没能弄清它是怎样发生的。
- I'm curious asto how it happened. 我很好奇到底发生了什么。
- I don't know how it happened; I lost my nerve completely then. 我不知道事情是怎么发生的，当时我惊惶失措，全然不知。
- Mr Fitzgibbon says what he did was wrong but could not explain how it happened. 菲茨吉本说，没有申报是他的错，但他却无法解释其中的原因。
- It is unclear how Israel will react to the flight. 目前还不清楚以色列将如何反应。
- How it would work in practice is unclear, but critics fear that it will legitimise mob rule. 它将如何运作尚未可知，不过批评家害怕它会使民众统治以宪法的形式确立下来。
- But it is unclear how sustainable this boom is. 但目前尚不清楚房地产的火爆局面会持续多久。
- It is unclear how the effectiveness of the plan will be gauged.The government has not made public a specific target for emissions levels or said how it will measure air quality. 目前尚不清楚如何衡量此项措施所带来的效果，政府没有公开具体的目标，或者说将如何评估空气质量。
- He gladly showed it to me; I admired it and asked him to tell me all about how it happened to be drawn. 他很高兴的取出来给我看，我表示羡慕、赞美，同时请他告诉我，开出这张支票的经过情形。
