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Earthen sites,which are mainly made of earth,are cultural heritages with historical,artistic and scientific values.Many ......
城镇是生态环境的脆弱区之一,随着吉林省工业化的快速发展,雾霾、风沙天气也频繁出现,越来越影响广 大人民群众的日常生活,因此需......