Why is marking a book necessary? Because it keeps you awake.

为什么在书上做标记是必要的？因为它会让你保持清醒。

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Marking a book is a useful skill, but it's important to do it right.

在书上做标记是一项有用的技能，但重要的是要做对。

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Genetic marking is the equivalent of giving every book a title, table of contents and index-and with much greater speed and accuracy than any librarian could manage.

基因标记相当于给每本书起名，建立内容目录和索引，而且其速度和准确度是任何图书管理员都无法做到的。

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Digg.com is a social content site - one which combines social book marking with blogging - and all democratically controlled by its users.

BBC: Picnik website

Pages and chapters are indexed for quick reference and book-marking.

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It will appear in an anthology next year, marking the first time I've ever had an idea for a work of fiction while on a book tour.

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