translation.en: For example, during the Great Depression, they created the Hoover Dam, which in turn, created Lake Mead and made it possible for the cities of Las Vegas and Phoenix and Los Angeles to provide water for people who lived in a really dry place.
translation.zh: 比如在大萧条时代， 他们修建了胡佛水坝， 拦下的水形成了米德湖， 为几个位于干旱地区的城市， 比如拉斯维加斯、凤凰城 和洛杉矶供水， 让那里的市民有水可用。