英国经济学家马歇尔(Alfred Marshall)在其著作《经济学原理》(principles of eco—nomics)一书中明确表示：土地是指自然赋予人类的水陆、空气、光线、热能等。
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The article also exemplifies the basic theory and design principles of two construction models and introduces in details the eco-village models of countryside, mountainous areas and courtyard.
阐述了全村总体型和家庭生态型二种建设模式的基本原理与设计原则，并详细介绍了城郊型生态村，山区型生态村，庭院型生态村模式。
Based on the research achievements of concrete pumpability and the principles of practical use, eco-nomic and convenient, the research results of the MApumping agent are introduced.
本文以混凝土可泵性研究成果为依据，本着实用、经济、方便的原则，介绍了MA泵送剂的研制结果。
With Guizhou karst areas as an example, this paper discusses the main principles and quantifies the index for division of eco-environmental fragility types in karst region.
该文以岩溶地貌发育典型、碳酸盐岩出露面积广的贵州省为例，论述了岩溶区生态环境脆弱性类型划分的主要原则，探讨了脆弱性类型划分的指标并进行了量化。
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