Thousands of Russians are staging a somber demonstration in the nation's capital, protesting and mourning the victims of the school siege in the country's restive Caucasus region.

词汇：

stage n.舞台, 戏剧, 活动场所, 发展的进程, 阶段或时期, 驿站
        vt.上演, 筹备, 举行

somber adj.阴森的, 昏暗的, 阴天的, 忧郁的

protest n.主张, 断言, 抗议
           v.主张, 断言抗议, 拒付

siege n.包围, 围城, 长期努力, 不断袭击, 围攻
        v.包围, 围攻

restive adj.难控制的

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