因此，美国坚持要求在哥本哈根为共同应对这项巨大的全球挑战达成一项成功的协议，对于美国的决心不应该有任何怀疑。

So there should be no doubt about the commitment of the United States to reaching a successful agreement here in Copenhagen and meeting this great global challenge together.

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哥本哈根的这一约定表明我们在应对气候挑战方面是认真的。

Such a deal in Copenhagen will demonstrate that we are serious about tackling the climate challenge.

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来自190多个国家的代表已经聚集在哥本哈根，希望能够应对我们的地球面临的迫在眉睫的挑战。

Representatives from more than 190 countries have gathered in Copenhagen in the hopes of meeting this urgent challenge to our planet.

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