樓主忘了一個重要的因素：人口爆炸式的增長，吃飯不幹活的未成年人多了，糧食短缺就不可避免了。

來源: 東坡學士於 2015-02-24 08:45:49 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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