需求表水一个单元在目标环境中可能拥有的需要。
Requirement represents the need that a unit may have in the target environment.
不同形态的水需要不同的价格来反映不同使用者的需求。
Different categories of water need different prices to reflect the different preferences of users.
收集水、净化水和分配水都需要能源消耗，特别在好像南加州那样有广阔需求的地方，需要通过几百公里管道运输水到洛杉矶。
It takes power to gather water, purify water, and distribute water, especially in places like southern California where water is piped hundreds of miles to supply Los Angeles' sprawling demands.
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