图书馆目录的标签可以生成任何书籍的活动地图并且知道搜索者找到它，甚至是当它已经下架，被上一个阅读者放在桌子上的时候。

Tabs in library catalogs can make active maps to any book and guide searchers to it, even if it is off the shelf and on a table from the last reader.

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可是最近的研究却进一步认为上一个世纪人类的活动使海平面提高了全部上升量的四分之三以上。

The latest study goes much further, faulting people for more than three-quarters of the sea-level change during the past century.

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你可能会在一个不喜欢的场合痛苦地呆上一个小时，但是从中可以学到哪些活动需要参加，哪些活动需要跳过。

You spend an hour in a very uncomfortable setting, but you learn what to go to and what to skip.

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I had the experience of seeing one of my outward bound students years after at a reunion event.

我曾经在一个重聚的活动上,看到多年前拓展训练时,我的一个学生。

普林斯顿公开课 - 人性课程节选