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城市是人类文明集中的地方。由于自然资源的分布及经济建设的需要,出现了许多性质不同的城市或市区。有的以政治、文化、科学、教育事业为主,有的以钢铁、机械制造业为主,有的以商业为主,有的是综合性城市。不论城市的性质和特点怎样,一个共同之点就是大自然离开城市越来越远,环境污染越来越严重,而绿化是对付日益严重的环境问题的有效手段。
The city is where human civilization is concentrated. Due to the distribution of natural resources and the need of economic construction, many cities or urban areas with different characteristics have emerged. Some are mainly political, cultural, scientific and educational. Some are mainly made of steel and machinery, some are mainly commercial, and others are comprehensive cities. Regardless of the nature and characteristics of the city, one thing in common is that nature has moved farther away from the city and environmental pollution has become more and more serious. And greening is an effective measure to deal with the increasingly serious environmental problems.