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所属栏目：绿色空间
所属频道：CCTV-10科教
年份：2011
展开全部
简介：本期主要讲述水资源的重要性。好多地方原本都是绿洲最后变成沙漠。面对缺水的事实，我们要懂得知危思变。收起
知危思变 上
知危思变 下
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