开展沼气综合利用，能够促进农村生态环境的良性循环，改善农村环境卫生条件。
By comprehensive utilization of biogas rural economics and eco - environmental sanitation can be improved and good ecological cycle can be formed.
物质循环、再生利用的生态学原理是自然资源和环境从有限到无限的生命原则。
Circulating and regenerating mechanism make the natural resources from finite to infinite and it is the life rule for ecosystem.
它以生态系统中能量多级利用和物质循环再生为基本原理，按照这一原理，就可以合理设计食物链。
It takes advantages of the basic ecosystem principle of multi-level energy exploitation and substance recycling to reasonably design food chains.
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