当本周内被问及是否会对此做出承诺时，奥巴马的首席谈判代表，精明的乔纳森·潘兴说，美国仍然在寻求科学证据。

Asked this week if he's committed to it, Obama's slick chief negotiator, Jonathan Pershing, said the US was still looking at the science.

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但是美国首席谈判代表乔纳森·潘兴(Jonathan Pershing)对此回应时表示，美国希望达成一个协议。

But US chief negotiator Jonathan Pershing responded that the US wanted a deal.

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美国气候变化副特使乔纳森·潘兴在评论欧盟提出的路线图时说，它必须平等地约束所有各方。

Commenting on the EU's proposed roadmap, U. S. deputy climate change envoy Jonathan Pershing said it would have to bind all parties equally.

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