The contradiction between large scale virescence and water shortage was discussed. 本文讨论了大面积绿化与水资源短缺之间矛盾。
To deal with the water shortage, Las Vegas sends some of its used water back into the Colorado River to use again. 为了解决水资源短缺的问题,拉斯维加斯将其已利用过的水流回至科罗拉多河,以便重复利用。