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垃圾分类见成效，德国用40年，日本用27年，中国将用多少年？
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这是我国正式开展垃圾分类的第20个年头。顺便提一句，垃圾分类见成效，日本用了27年，德国用了40年，而我国经济发展与社会进步的很多方面，进度都要快于发达国家。
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