NASA的卫星图片显示，2005年- 2009年间，由于连续的干旱，湖水日益枯竭。2010年夏，干旱结束后湖水水量才开始增加。

The NASA pictures show how they shrank even further between 2005 and 2009 because of severe drought, and then increased in the summer of 2010 after the drought breaks.

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注意“净值”这一词：测量地下水渗入并且渗出湖水的实际水量比仅仅推断出它们的差异要复杂得多。

Note the word "net" measuring the actual amounts of groundwater seepage into the lake and out of the lake is a much more complicated matter than merely inferring their difference.

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由于没有排水口，里海的水量流失只能依赖蒸发，这也造成湖水中盐的积聚。

Lacking an outlet, the Caspian Sea loses water only by evaporation, leading to the accumulation of salt.

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