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恐龙灭绝式的灾难会重演吗？科学家称：类似威胁，其实从未消失过
科学家称，类似灭绝恐龙的小行星撞击，地球上平均每一亿年就可能出现一次。那么，下一颗希克苏鲁伯小行星，会在何时到来呢？
探索宇宙奥秘，发现更多不可思议119/197
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