⊙、谁是生命的源泉，珍惜水源就是珍惜人类的未来。
Who is the source of life, treasure the water is to cherish the future of humanity.
水是人类最宝贵的资源之一。但在因水质降低或水源不足而危及水的利用之前，人们一般都不珍惜它。
Water one of man's most precious resources, is generally taken for granted until its use is threatened by reduced available or quality.
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