1、 With the decreasing labefaction of our environment,the useable fresh water is facing pollution and becoming exhausted in the large-scale,and shortage is a threat to the whole world as well.
但是，当今随着人类生态环境的日益恶化，世界可用淡水资源正在逐渐枯竭并普遍受到人为污染，全世界正面临着可用淡水资源短缺的威胁。
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