书页里折起来标注阅读位置的页角。

A corner of a page turned down to mark your place.

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更改该页的纸张、页眉、页角、方向以及页边距。

Changes paper, headers and footers, orientation, and margins for this page.

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而且在计算机屏幕上，你不可能像书本一样做各种细微的记号(折起来的页角和铅笔做的注释等)。

The difference is that, on the computer screen, you lose many subtle visual cues offered by the paper-based book (bent page corners, penciled-in notes).

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