Completed nutrient recycling chain is crucial for the health and sustainable development of agro - ecosystem.

完整的营养循环是农业生态系统健康、可持续发展的重要保障.

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Biogas system is the pivot in material recycling and energy transformation of a complex agro ecosystem.

沼气发酵系统是复合农业生态系统中物质循环和能量转化的枢纽.

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