求翻译：对1式进行数值模拟，可得图3.此图表示流入的污染浓度逐渐减小，污染得到逐步控制时，湖水污染状况随相对时间变化呈指数递减关系，湖水污染浓度最终趋于0.图 3与图1的区别在于，在污染得到逐步控制时，湖水污染浓度最终为0.是什么意思？

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Carries on the value simulation to 1 type, may result in the Figure 3. this chart to express the inflow concentration of contaminant reduces gradually, when the pollution is under the gradually control, the lake water pollution condition assumes the index degression relations along with the relative

-1 numerical simulation, Figure 3. This figure represents the inflow concentrations decreased pollution be controlled gradually, diminishing water contamination decreases exponentially with time, lake water concentration approaches 0. Figure 3 differs from Figure 1, step by step in pollution control

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