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小朋友们,你们知道吗?2.5亿年前,地球上的陆地都是连在一起的,这片陆地的面积非常大,科学家们把这块陆地叫做"泛大陆"。那时气候非常干燥,植物很少,所有生物都在这片有些荒芜的大陆上生活着。在三叠纪时期,鳄类是当之无愧的霸主,恐龙的数量还非常少,显得很孤单,所以它们往往结伴生活,在这片陆地上寻找食物和休息的地方。