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学历类考试 - 教育硕士
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You type a word or phrase into an Internet search engine such as Google or Yahoo, hit return and in an instant, dozens of "hits" -Web sites containing words that match your query-appear on the computer screen. Now imagine a similar database that operates not with words but with shapes, specifically, leaf shapes. It would work like this: carry a camera cell phone into a forest, pick a leaf from a tree and snap its
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