求翻译：图4.6为两个次用户获得的总利润。由图可知，次用户1获得的总利润 随着时间先增加后减小，变化较快；而次用户2获得的总利润 先减小后增加，变化比较慢，且在变化过程中 始终大于 。当次用户1运动到 时，次用户1总收益达到最大；当次用户1运动到 时，次用户2的总收益减小到最小之后又增加。是什么意思？

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Figure 4.6 the two users to obtain the total profits. The figure shows that the user 1 for the total profit over time to increase, decrease, and relatively fast-changing; while the second user 2 for the total profit to decrease the increase, the change is relatively slow, and the process of change i

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Figure 4.6 total profits gained for two users. As the chart show, time, user 1 total profit first increases and then decreases over time, changes rapidly, while user 2 the total profit decreases and then increases, change is slow, and is in the process of change is always greater than. When user 1 s

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