If scientists are to study massive datasets such as mobile phone records, search queries and movie ratings, the owners of these datasets need to find a way to anonymize the data before releasing it.
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Google的普通搜索也可以确实也可以得到精确的结果，不如用"movie:" 来寻找电影评论。
The general search engine can get very specific indeed. Try movie: to look for movie reviews.
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