大城市的居民普遍面临着各种各样的环境污染。许多城市原来的湖泊、绿地、河流已经面目全非,居民很难拥有一片净土。可喜的是,目前市政建设与自然环境的美化越来越受重视,在一些国家已成为风尚。居住环 Residents of large cities generally face a variety of environmental pollution. The original lakes, green areas, and rivers in many cities have changed beyond recognition. It is difficult for residents to have a pure land. Fortunately, at present, the beautification of municipal construction and the natural environment has become more and more important, and it has become a fashion in some countries. Residential ring