The contradiction between large scale virescence and water shortage was discussed. 本文討論了大面積綠化與水資源短缺之間矛盾。
To deal with the water shortage, Las Vegas sends some of its used water back into the Colorado River to use again. 為了解決水資源短缺的問題，拉斯維加斯將其已利用過的水流回至科羅拉多河，以便重複利用。
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