Scientists do not know why dinosaurs became, but some theories that changersin geography, climate, and sea levels were responsible.

科学家不知道恐龙为何了，但是一些理论推断是地理，气候和海平面的变化造成的。

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Scientists do not knowwhy dinosaurs became extinct, but some theories postulate that changersin geography, climate, and sea levels were responsible。

科学家不知道恐龙为何绝种了，但是一些理论推断是地理，气候和海平面的变化造成的。

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Scientists do not know why dinosaurs became extinct, but some theories postulate that changes in geography, climate and sea levels were responsible.

科学家们不知道恐龙为何灭绝，但一些理论假定这与地理气候条件和海平面的某些变化有关。

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The researchers did not try to identify the causes of the increase, but they have some theories.

VOA: special.2009.08.06

I can't bring myself to believe it, I have some sympathies for valuable container theories, but I also have some sympathy for neutral container theories.

我无法让自己去相信它，我有点赞同有价值容器理论，但是我也有点赞同中性容器理论。

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Even Mr Monks admits his worldview may rely too heavily on conspiracy theories, but some paranoia is justified (besides, just because you're paranoid doesn't mean that nobody is out to get you).

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Have some theories, but be open to feedback.

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He said the lengthy and costly inquest had played a crucial role in testing those theories - but that some people would continue to believe in the murder theory no matter what the verdict was.

BBC: Duke 'did not order Diana death'