但是来自美国的两位研究员，一位是交通专家，另一位是大气科学家，他们认为把蓝天思考纳入世界诸多重大挑战之一时候来到了。

But two U. s. researchers, a transportation expert and an atmospheric scientist, decided the time had come to apply blue-sky thinking to one of the world's greatest challenges.

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当然。中国已经入世，在今后，当我们同外国人做生意时，我们必须用英语同他们谈判。

Of course. China has entered WTO. In the following days, when we trade with the foreigners, we should negotiate with them in English.

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因为这一问题是现实存在的，并不只是中国2001年加入世界贸易组织时的遗留问题。

So the issue is alive and well, not just a historical relic from China's accession to the WTO in 2001.

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