1992年,世界环境组织和世界健康组织得出结论,调查的20个可能将在2000年,人口超过1000万的大城市,他们的污染物指标(至少一个主要的指标)已经超过世界健康卫生组织的标准,其中三分之二的,超出指导指标2.7--3或者更多.
英语翻译In 1992,the United Nations Environmental Programme and t
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