The fact that lake levels in the semiarid southwestern United States appear to have been higher during the last ice age than they are now was at one time attributed to increased precipitation.
美国西南部半干旱地区的湖泊水位在上一个冰河时代似乎比现在更高，这一事实曾一度归因于降水增加。
Since lake levels are controlled by rates of evaporation as well as by precipitation, the interpretation of such levels is ambiguous.
由于湖泊水位是由蒸发率和降水量控制的，对这种水位的解释是模糊不清的。
Reductions in lake levels here seem to driven by reductions in rainfall rather than increased evaporation.
这里看到的湖泊水位下降似乎是由降雨量下降造成的，而不是由越发增多的蒸发造成的。
During this past research season the scientists recorded unprecedented lake levels caused by higher glacial runoff.
科学家们在上一个科考季发现，受到高处冰川径流的影响，这里的湖泊水位上升到了前所未有的水平。
The ruins of an ancient village submerged by the construction of a hydroelectric dam resurface when lake levels are low.
古代村落的遗迹因水电站建设而被淹没，而当湖水位下降时又重新露出水面。
They were exposed when lake levels dropped dramatically after tributary rivers were diverted to provide water for nearby Los Angeles.
当湖水的水位在湖的支流为洛杉矶供水改道而急剧下降后，这些石灰华就显露了出来。
This image from April 2010 is the latest update in the Earth Observatory’s feature World of Change: Water Levels in Lake Powell, which documents changes in lake levels each spring since 1999.
这幅2010年4月份的图来自最近更新的“地球观察”的专题变化的世界：鲍威尔湖水位，（此系列图文）记录了自1999年以来每年春季该湖水位的变化。
This image from April 2010 is the latest update in the Earth Observatory’s feature World of Change: Water Levels in Lake Powell, which documents changes in lake levels each spring since 1999.
这幅2010年4月份的图来自最近更新的“地球观察”的专题变化的世界：鲍威尔湖水位，（此系列图文）记录了自1999年以来每年春季该湖水位的变化。
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