求翻译：图1表示当流入的污染浓度小于湖水初始污染浓度时，湖水污染状况随相对时间变化的指数变化关系，湖水污染浓度最终趋于K是什么意思？

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Figure 1 indicates that the flow of air pollution concentration less than lake water initial pollution concentration, the lake water pollution situation with the relative time of the index changes, the lake water pollution concentration ultimately tends to K

Figure 1 expression when flows in when the concentration of contaminant is smaller than the lake water initial concentration of contaminant, the lake water pollution condition along with the relative time change index change relations, the lake water concentration of contaminant finally tends to K

Figure 1 indicates that when the concentration is less than the initial contamination of Lake inflow concentrations, water pollution varies with the relative time index of this relationship, lake water concentrations eventually tend to be k

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