普通文件IO操作将看不到这个数据，但任何程序都可以使用一个特殊的扩展属性api来访问它。
This data wouldn't be viewable by normal file IO operations but could be accessed by any program using a special extended attributes API.
研究人员将这些参与者与2700多名没有玩任何益智游戏，但用相同时间上网并参与普通知识问答的人作对比。
They were compared to more than 2,700 people who didn’t play any brain games, but spent a similar amount of time surfing the Internet and answering general knowledge questions.
研究人员将这些参与者与2700多名没有玩任何益智游戏，但用相同时间上网并参与普通知识问答的人作对比。
They were compared to more than 2, 700 people who didn’t play any brain games, but spent a similar amount of time surfing the Internet and answering general knowledge questions.
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