The chain length distribution of a oligomeric polystyrene sample initiated by n-butyl lithium was determined by high performance size exclusion chromatography on a ultraviolet absorption detector.

用高效尺寸排除色谱以紫外吸收光度计寿检测器，测定了一个以正丁基锂引发的聚苯乙烯齐聚物的链长分布。

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U.N. officials in Goma say they began to insist on the exclusion of Mr. Ntaganda from all operations involving the U.N.

WSJ: U.N. Peacekeepers at War in the Congo

So far, the U.N. says it has only been able to confirm a minimal withdrawal from the exclusion zone around the battered city.

CNN: Waiting for morning

In official reports, however, all too often, the issue is mentioned only in passing or is relegated to a footnote -- and the principal U.N. resolution on the subject focuses on female victims of sexual violence almost to the exclusion of male victims.

CNN: STORY HIGHLIGHTS