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Tibet on the roof of the world is covered with snow for a greater part of the year, when a freezing cold holds sway.There is less oxygen in theatmosphere there than in areas on lower altitudes.Living in such hostile conditions, Tibetans have a craving for life.A Tibetan folk song sings prayers of ci ren, or longevity.Tibetan herdsmen accost each other with greetings of ci ren.Countless numbers of Tibetans are called Ci ren.