求翻译：当流入湖泊的污染浓度一定时，湖水的污染浓度变化与时间长短有关!短期内依赖于湖水的平均保留时T：T越长，污染浓度变化越慢，T越短，污染浓度变化越快。是什么意思？

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When you into a lake of pollution concentrations in time, the lake water pollution concentration and length of time on! In the short term depends on the water of the lake average retention time T: T is longer, the pollution concentration changes more slowly, T, the more air pollution concentration c

When flows certainly in the lake the concentration of contaminant certainly, lake water concentration of contaminant change and time length related! In the short-term relies on when the lake water average retention T:T is longer, the concentration of contaminant change is slower, T is shorter, the c

When when the concentration of pollution flow into lakes, lake water pollution concentration and duration! average retained T:T depended on the water for a short period, the longer the concentration changes more slowly, the t is shorter, faster pollution concentrations.

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