地球上20%淡水流经这里

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北美五大湖，是世界上最大的淡水湖。它储存了世界上百分之二十的淡水。在世界上许多城市缺水的今天，五大湖的淡水好像取之不尽。安大略湖是五大湖最东边的一个，五大湖的水通过尼亚加拉大瀑布流进安大略湖，最后经由圣劳伦斯河流入大西洋。当天气转暖阳光普照，安大略湖畔进入到了美丽的夏季...

 

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