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How do you recognize whether a site is spam site? And explain the definition of "spam site". I don't understand what you mean under these words... there is no definition in any dictionary or in the wiki ..
Go look at them. Spam sites generally are obvious at first glance, the content looks and reads like it was written by a student in an english as a second language class.
Most times its just someone elses content or plr articles ran through a spinning software to make it "unique" then reposted, with about 20000 backlinks from forum profiles and web2.0 profiles and blog comments.
Those methods of getting backlinks can be done by a simple automated fire and forget script.
You can rank a site just by doing that, if you do enough of it, but after a while it'll usually fall off the rankings.