城市人口密集,工厂烟囱林立,汽车穿俊行驶,不断喷放出烟尘毒气,严重污染着城市环境。城市居民的身体健康和劳动、工作、学习效率无不受到影响。所以,美化城市,改善环境,发展城市园林.早已成了现代化城市建设的一个重要组成部 City densely populated, factory chimneys everywhere, cars wear Jun driving, continue to emit smoke and dust gas, serious pollution of the urban environment. The health of urban residents and the efficiency of work, study and work are all affected. Therefore, to beautify the city, improve the environment and develop urban gardens has long become an important part of the modernization of urban construction