Agrochemicals had destroyed the natural cycles of nutrient renewal that intact ecosystems use to maintain themselves.

农用化工产品破坏了原始生态系统赖以生存的营养更新的自然循环。

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The reproductive cycle of marine bivalves is closely related to cycles of nutrient storage and use and to environmental factors such as water temperature and food availability.

海洋贝类的繁殖周期与营养物质储存、利用和环境因子（如海水温度、食物可得性、盐度等）密切相关。

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Effluent waste from these concentrated animal facilities are undermining what little clean water and healthy micro-nutrient cycles still exist out there.

FORBES: So Long To The Era Of Cheap Food?