一个意外的惊喜在于，人们对水的需求并没有像一些人预测的那样快速增长。
Fortunately — and unexpectedly — the demand for water is not rising as rapidly as some predicted.
在19世纪和20世纪的工业革命和人口激增期间，人们对水的需求急剧上升。
During the industrial revolution and population explosion of the 19th and 20th centuries, the demand for water rose dramatically.
干旱时期，上调价格以降低人们对水的需求。
In periods of drought, its price would increase and people would therefore demand less.
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