Raw matena dEn 城市与其周围环境的联系 ere is a constant renewal of material and energy in the landscape, in natural cycles and in one-way transformations and vement Settlements and land use have to some extent been adapted to meet nature s conditions. But the increasing sity of settlements, technological progress and changes in our life style greatly affect these processes, resulting arious environmental probl城市与其周围环境的联系