Switches are like "optional" parts of the template. They only appear if the switch is set. If the switch is not set, it's simply not shown.

开关类似于模板中的可选部分，只出现在开关设定的情况下，如果开关没有设定，开关标记的中间部分模板将不会被显示。

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Within the XML configuration file, you can add a switch and set its value, remove a switch, or clear all the switches previously set by the application.

在这个档案内，您可以加入切换控制并设定其值、移除切换控制，或清除应用程序先前设定的所有切换控制。

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The second set was a complete switch, with Davenport struggling and Henin-Hardenne finding some form.

BBC: SPORT | Tennis | Davenport falls to Henin-Hardenne

The bad: In just over a year, you'll switch on the set and find nothing literally nothing to watch.

NPR: A Year Out, Digital TV Picture Still Far from Sharp

Like the rest of the election campaign so far, nothing seems set to move anybody to switch their votes from any decision they may have taken in the last four years.

BBC: Don't forget the don't-care vote