化肥和粪肥都释放氮到自然生态系统，如河流，从而破坏自然的平衡。

Both fertilizers and manure release nitrogen into natural systems such as rivers, upsetting the natural balance.

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你能做的就是尽量保持氮平衡。

What you can do is try to maintain nitrogen balance.

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各组织中尿素氮的代谢平衡在长期应激时趋于稳定，但这种稳定是建立在较高水平基础上。

The metabolic balance of the creatinine and urea nitrogen tend to be stable in the long-term strere, but the stabilization is in a high level .

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