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1. The preview switcher on the TV is very useful for quickly switching between different programs.
电视上的预览切换器对于快速切换不同的节目非常有帮助。
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2. The software's preview switcher allows users to see how their designs will look before they are finalized.
该软件的预览切换器允许用户在最终确定之前查看他们的设计效果。
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3. During the presentation, the presenter used a preview switcher to show different aspects of the topic at hand.
在演讲过程中，演讲者使用了预览切换器来展示话题的不同方面。