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目前，国内外对林地外部效应评估的研究十分缺乏。
It was very lack to research external effect of woodland appraisement at the moment.
youdao
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从集聚效应和外部规模经济进行的研究；
Study on the effect of gathering and scale economy;
youdao
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从集聚效应和外部规模经济进行的研究；
Study on the effect of gathering and scale economy;
youdao