Lake powell took 17 years to reach high-water mark. 鲍威尔湖用了17年才达到最高水位

107. Its flow is diminishing at source.
     它的源头正在日益萎缩
108. Water levels in the catchment lakes along its course...
     流域中的蓄水湖泊水位
109. Are plummeting.
     也在骤降
110. Lake powell took 17 years to reach high-water mark.
     鲍威尔湖用了17年才达到最高水位
111. Its level is now half of that.
     现在的水位已下降过半
112. Water shortages could affect nearly two billion people...
     截止至2025年 水荒问题
113. Before 2025.
     会影响近二十亿人

来自《家园 第二部分 Home Part2》第 110 行