三大效益相协调的原则；
本文对林业在城市生态环境建设中的三大效益进行了定性与定量的评价。
In this dissertation, it also makes qualitative and quantitative evaluation on the three major benefits (ecology, economic and social ones) of forestry in the urban ecology environment construction.
森林的特殊作用决定了其具有三大效益，即经济效益、社会效益和生态效益。
According to its special functions, forest has three benefits, i. e. , economical, social benefit and ecological benefit.
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