云街的形成机制
http://blogs.nasa.gov/cm/blog/whatonearth.blog/1014873main_lake%20clouds.jpghttp://blogs.nasa.gov/cm/blog/whatonearth.blog/1014875main_lake%20effect%20snow%20diagram.jpg 另外一个例子:
http://wwwdelivery.superstock.com/WI/223/4029/PreviewComp/SuperStock_4029R-339890.jpg
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