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1.To preview the new feature, press the switch on the remote control.
为了预览新功能，按遥控器上的开关。
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2. The software has a built-in preview switch that allows users to test the application before downloading.
该软件内置了预览开关，允许用户在下载应用程序之前测试它。
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3. When you're editing a document, use the preview switch to see how it will look with different fonts and styles.
当你编辑文档时，使用预览开关来查看不同字体和样式下的效果。