internalize forest externality principle 森林外部性的内部化基准
principle of forest sustained yield 森林永续利用原则
They have got environmental approval in principle. They have not got full forest clearance.
原则上，他们已经获得了环境许可，但没有获得森林的全权许可证。
In principle, any old trees would do—although they die and rot, more forest cover would lock up more carbon dioxide.
从理论上说，任何成木都能做到这一点，尽管它们也会枯萎腐烂，但是更大的森林覆盖将会锁住更多 的二氧化碳。
Strategy and principle for establishing basic forest resource information system are given.
阐述了建立森林资源基础信息管理系统的原则和策略。
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