Many environment mathematical models are ordinary differential equations where time is considered only as its effect on population density.

许多环境数学模型是用常微分方程表示的，它只考虑了时间对种群密度的影响。

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Many environment mathematical models are ordinary differential equations where time is considered only as its effect on population density.

许多环境数学模型是用常微分方程表示的，它只考虑了时间对种群密度的影响。

youdao