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You don’t have to hold a Ph.D. to count the birds in your backyard.
出處:Crowdsourcing http://www.amazon.com/gp/product/0307396207?ie=UTF8&tag=a0b8a8-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0307396207
Andrew的email:andrewlo0623@gmail.com
Andrew的網址:http://andrewlo.blogspot.com
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