You can then collapse and expand the regions when you want to hide or show them.

当您要隐藏或显示这些区域时，就可以折叠和展开它们。

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Users can manage the display of the sidebar, or they can choose to hide or show the entire sidebar.

用户可管理边栏的显示，也可选择隐藏或显示整个边栏。

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Performing logical tests that determine such choices as whether to hide or show a particular element.

执行逻辑测试来做出各种选择，比如隐藏还是显示某个元素。

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Among some bug fixes, you can now make use of a built-in browser, "Send and Archive" messages, filter specific folders and labels, clear your spam and trash bins and even set which accounts you'd like to show or hide dock badges for.

ENGADGET: Sparrow mail app for iOS hits version 1.1, Push support to follow 'with or without Apple'

"Ever since the launch of Timeline, people have had the ability to control what posts they want to show or hide on their own Timelines, and today we're extending that to other information they post, starting with the Facebook address, " the Facebook spokesperson added.

CNN: Facebook just switched your default e-mail address

If a person complained or clicked to hide a story from that person before, it may not show up.

FORBES: Facebook Clears The Air On News Feed, Promoted Posts