natural ecological elements 自然生态要素
E. ecosystem from its ecological elements, system balance, system adjustment, aiming to offer reference for the large system of P.
从可获得的资料来看，从生态学的角度出发，把体育作为一种生态系统进行研究，国内还较为鲜见。
Water is one of the most crucial elements in ecological landscape, for it's the source of all lives.
水是生态景观中最重要的元素之一，有水才会有生命。
Weathering and pedogenesis of rocks are important sources of mineral elements for ecological systems, and key processes of global biogeochemical cycling of mineral elements.
岩石风化成土作用是生态系统矿质元素的重要来源，也是全球矿质元素生物地球化学循环的重要环节。
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