A bit further back, Teddy Roosevelt founded the national park system, among other efforts to conserve the natural heritage of the United States.
再稍往前，连同保护美国自然遗产的努力，泰迪·罗斯福建立了国建公园制度。
His writing and speaking raised the awareness of the importance of conservation and helped bring about our national park system.
他的写作和演讲提高了人们对保护自然的重要性的认识，并帮助建立了我们的国家公园系统。
Using Geographic Information System(GIS), the change of landscape pattern in Zhangjiajie National Forest Park during 1990—2000 was studied.
利用地理信息系统（GIS）技术，研究1990—2000年张家界国家森林公园景观格局的变化。
Using Geographic Information System(GIS), the change of landscape pattern in Zhangjiajie National Forest Park during 1990—2000 was studied.
利用地理信息系统（GIS）技术，研究1990—2000年张家界国家森林公园景观格局的变化。
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