历史上有许多不解之谜,其中之一就是这么多文明社会居然会一下子崩溃。最近考古学家发现,许多很不相同的古代文明的崩溃历程却是惊人地相似,它们均遭受到不同形式的环境退化和气候变迁,由此产生的衰败使入侵民族有可乘之机。 There are many puzzles in history, one of which is that so many civilized societies will suddenly collapse. Recently, archaeologists have found that the collapse of many very different ancient civilizations is strikingly similar. Both of them are subjected to different forms of environmental degradation and climate change. The resulting decline makes the invaded nation an opportunity.