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File:Light pollution country versus city.png
来自维基百科,自由的百科全书
Found in articles
File:Light pollution country versus city.png
English Comparison of the effect of
light
pollution
on the visibility of stars in a rural and a metropolitan area. Flickr user ID: 79297308@N00 author
File:CK12 Life Science2.pdf
in New York
City
in 1999. Notice how rapidly the virus spread across the U.S. 6 (Source: http://en.wikipedia.org/wiki/Image:WNVUSAMap.
png
, License: GNU