Scientists are continually learning more about sleep, but one thing they know for sure is this—for humans, it is as important as food and water.

科学家正在不断加深对睡眠的研究，他们对其中的一件事实确信无疑：对于人类来说，睡眠与食物和水一样重要。

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But I know one thing for sure -i don't want to be seen as typecast.

但我可以肯定一件事：我不想给自己定型。

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One thing we know for sure is that the British economy will suffer its first recession for 18 years in 2009.

头一件我们可以肯定的事就是英国的经济将在2009年经受18年来的第一次衰退。

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Smart hospitality leaders know one thing for sure: a great guest experience begins with a great first impression.

FORBES: What's the Big Deal With First Impressions? Leadership Lessons From Fine Hotels

But seeing their bill and our bill, I know one thing for sure -- we'll have a great bill when we put them together.

CNN: Pelosi asks to see better way than public option

After the first two days I know one thing for sure, that this is going to be a cracker of a Test match, which could all hinge on one great partnership, one great innings or one more match-winning bowling spell.

BBC: Justin Langer's key moments