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The literatures status can be labeled with “read” or “unread” automatically by certain marks or colors. For example, I downloaded or imported some literatures from the web, all of them will be labeled with “unread” , after the click on the titile, it will change into “read” automatically. And the user can also change the status manually.
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The user can label the literature with its importante or useage or something like this. And the level could be found by a glance on the literature (for example, from one star to five star to distinguish the importance of the literatures). This is helpful in review the literatures.