Fresh water comes from ponds, lakes, rivers and streams. 淡水来自于池塘、湖泊、河流和溪流。

　　People use fresh water for drinking, farming and so on. 淡水可用于饮用、耕种等等。

　　People can only drink fresh water. 人们只能饮用淡水。

　　People should drink 2 liters of water every day to make their bodies healthy. 人们每天需要饮用2公升淡水来保证身体健康。

　　Believe it or not, 18 percent of the world's population does not have enough drinking water. 不管你相不相信，世界上18%的人口缺乏足够的饮用水。

　　Therefore, people should try to protect fresh water on Earth.  因此，人们要保护地球的淡水资源。