To explore the role of the bridged N atom for a possible proton transfer in the active site of hydrogenase, we tried to introduce a hydrogen bond into a couple of designed molecules.

为研究氢化酶活性中心氮桥结构中氮原子是否起到质子摆渡的作用，设计了在分子内引入氢键的结构。

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UNESCO, the U. n. educational, scientific and cultural organization, is playing a major role in the creation of the memorial - including an education campaign.

联合国教科文组织在建造纪念碑上扮演了重要的角色，包括教育宣传活动。

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The selection of relaxation factor plays a key role in D?N domain decomposition methods(DDM).

N区域分解算法中， 松弛 因子的选取起着关键作用。

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The U.N.chief said his role would be as an advocate for the world's poorest people, who he fears will suffer the most if donor countries reduce their international assistance or do not fulfill their aid commitments.

VOA: standard.2009.03.25

The role of U.N. peacekeepers should be more clearly defined to focus on the protection of civilians.

CNN: Commentary: No one is safe in Congo strife

To date, the administration has resisted a prominent U.N. role in the political transition, although it has not flatly ruled out such cooperation.

CNN: U.S. seeking U.N. support, help on Iraq

It is expected a large part of Brahimi's work will involve Iraq and that he will help define the U.N. role in the country.

CNN: Annan gets special adviser on Iraq