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.
但自1980年以来，在一系列帮助家庭和工业节水的新技术应用之后，人均用水量实际上有所下降。
But since 1980, the amount of water consumed per person has actually decreased, thanks to a range of new technologies that help to conserve water in homes and industry.
麻烦的是，目前人均用水量实际上每年增长1%左右。
The trouble is water consumption is actually increasing by about 1% a year.
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