文化：讲苏美尔人的，苏美尔人的civilization在两条河之间，当时情况很不好，只有树木可以利用，然后苏美尔人就砍木材建造房屋和工具，然后他们需要铜器，就用木头作燃料来炼铜，之后树很快被砍完了，导致两条河里有很多土壤中的矿物质，使得水变咸了，但当时苏美尔人依赖自给自足的农业，他们依靠这两条河灌溉土地，在水不适合灌溉后，粮食产量减少，使得苏美尔人的人口也减少，最后教授说，大家都以为苏美尔人灭亡的原因是战争，其实是缺少粮食。
Culture: speak Sumerian, Sumerian civilization between two rivers, then it's not good, only can take advantage of the trees, and then the sumerians had cut wood to build houses and tools, and then they need to copper, using wood as fuel to copper, after finished cutting down the tree quickly, there are a lot of minerals in the soil, lead to two river that salty water, but when the sumerians rely on agricultural self-sufficiency, they depend on these two river irrigated land, after the water is not suitable for irrigation, crop yields decrease, makes the population of the sumerians also reduced, finally, says prof everyone thought the sumerians destruction is the cause of the war, is a lack of food.
另外有一则好消息，针对