开始三天里两组小老鼠都能喝淡水和糖水，它们都更喜欢去喝糖水。
Both groups of mice were allowed to drink plain water and sugar water for three days, and all of the mice preferred the sugar water.
我们不能喝海水，怎样才能找到淡水？
人只能喝，用其他3% - - - - - -淡水来自河流、湖泊、地铁、和其他来源。
Man can only drink and use the other 3% - the fresh water that comes from rivers, lakes, underground, and other sources.
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