Mr de Boer said a deal was "certainly possible".

德布尔表示，协议“肯定有可能”达成。

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De Boer said that pledges for cuts in greenhouse gases so far were insufficient to meet the goal.

德布尔说，就目前对削减温室气体的承诺来看，不足以达到这个目标。

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"I think it's extremely unlikely we will see a legally binding agreement in Cancun," DE Boer said.

“我认为我们极可能在坎昆看不到一个具有法律约束力的协议，”德布尔说。

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Thetop U.N.climate official Yvo de Boer said it is time to act.

VOA: standard.2009.12.06

"The U.S. commitment to specific, mid-term emission cut targets and China's commitment to specific action on energy efficiency can unlock two of the last doors to a comprehensive agreement, " Yvo de Boer said.

CNN: China's premier to join Obama at climate-change summit

"This is a sign of developed countries' resolve and courage that the world has been waiting for in Poznan, " said Yvo de Boer, executive secretary of the UN climate convention.

BBC: Gore's tough message to leaders