有效性意味着人类仅控制一切可控因素，尽可能让生态系统自然生长。
Effective means we set all the controllable factors in it and allow the system to emerge into what they should be.
土壤生态系统中水分和养分的丰度和有效性决定土壤的肥力。
The abundance and availability of water and nutrients in a soil ecosystem determine its fertility.
只有控制土体中的蒸发量，才能改善土壤生态环境，提高土壤利用的有效性。
Only controlled the evaporation quantity in soil, that soil environment would be improved, the validity of soil would be boosted.
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