由于流域水资源开发、利用和保护与当地的社会、经济、文化等因素有关，各国立法模式有所不同。
Because basin water resources development, using and protection relate with local society, economy, and culture, basin legislation model presents the multiplicity in the world.
通过对耕地利用过程中存在的选择价值与外部性问题进行分析，在此基础上提出耕地非农化决策的优化模式，并简要阐述了耕地保护的政策启示。
It puts forward an optimum decision model of non agricultural use of cultivated land and makes a simple exposition of policy enlightenment on protecting cultivated land.
第三部分是对贵州三叠纪地质遗迹的保护性利用模式进行研究。
In the third part we investigated the sustainable use pattern of the Triassic in Guizhou geological relic.
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