Most of our serious illnesses and deaths in the U. S. now come from preventable diseases, such as heart disease. But we know what works to improve health.

如今美国出现的严重疾病和死亡大多是可以预防的，例如心脏病。我们知道怎样有效地改善健康。

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What else do you know about the U. s.? Now you can discuss in your groups. .

小组交流自己所知道的和在课下搜集的有关美国的常识。

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But we know now there are better ways to make structures like the landmark u.

但我们都知道，其实有许多更好的方法，可以让美国银行U。

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Now, you know with constant volume, H now it's not going to be delta H that's U straightforward to measure, it's going to be dealt u, all right.

好，现在你们知道在体积恒定的条件下，我们得到的不是Δ,我们直接测量到的是Δ,好，但这基本上也是一样的。

麻省理工公开课 - 热力学与动力学课程节选

The messages included: "u r very cute indeed" "very glad to know that u r fine now let celebrate this n have some fun on weekend " and "plz dnt say no u know I like u too much dnt break my heart".

BBC: Aberystwyth doctor six-month ban for 'flirting' texts

In the sovereign debt space, which is government bonds, the debt ratings of developed countries remain under pressure for downgrading, including in the U.K., France and as we all know now, here in the U.S. But emerging markets, which have enjoyed back-to-back years of credit rating upgrades are seeing those upgrade numbers dwindle, with some negative outlooks in some developing nations.

FORBES: For Fitch's Global Credit Ratings, It's Prognosis Negative

We have called for, and we know that the U.N. is now moving forward on an investigation of exactly what happened.

WHITEHOUSE: President Obama Holds a Press Conference with King Abdullah II of Jordan | The White House