One can raedily trace the disa earance of dinosaurs to a major cataclysmic event .
One can raedily trace the disa earance of dinosaurs to a major cataclysmic event .
人们很容易把恐龙消失的原因归结为重大的灾难性事件。
One can raedily trace the disa earance of dinosaurs to a major cataclysmic event .
人们很容易把恐龙消失的原因归结为重大的灾难性事件。