Quantitative researches on the effects of mountain forest road network on the environment in forest land were ignored in past.
山地林道网对林地环境影响的定量研究是一个重要的却一直未被重视的领域。
The paper developed the decision model for the optimum years of maintaining forest road network based on the analysis of all costs relative to the years.
通过对各项与林道网养护年限有关费用的系统分析，建立了合理养护年限的决策模型。
He also notes that the forest service is already struggling to maintain a crumbling network of 386,000 miles of road. Better it fix those roads, he says, than build more.
他同时表示，林业局对维护现有的386,000英里的支离破碎的道路已经非常吃力了，建新路还不如修老路呢。
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