(fresh water 淡水，湖水；shortage n. 不足，缺乏；inexhaustible adj. 用不完的，用之不竭的；tap n.水龙头；consider 考虑，思考；population n. 人口；development of industry and agriculture 工业和农业的发展；pollute 污染；in a word adv. 总之；water resources 水源；protect... from 保护) Global Shortage of Fresh Water