1、电脑打开PR软件。
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https://iknow-pic.cdn.bcebos.com/8435e5dde71190ef9a0b371ec01b9d16fcfa607b"/>
2、打开PR后，直接把视频拖动到时间轨道上。
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https://iknow-pic.cdn.bcebos.com/a50f4bfbfbedab6455f8e801f936afc378311e6c"/>
3、PR打开视频后，鼠标右键点击视频轨道，然后点击取消链接。
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4、点击取消链接后，就可以单独选中视频时间轴了，按Del删除。
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5、删除视频后，点击左侧的剃刀工具。
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6、用剃刀工具把要的一段音频切出来，然后把不要的选中按Del删除。
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7、都删除不要的音频后，把剩下拖动到最前面。
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8、按Ctrl+M导出，格式选择MP3格式，输出名称中可以选择输出路径。
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https://iknow-pic.cdn.bcebos.com/241f95cad1c8a786d20aeecf6909c93d71cf50ca"/>
9、设置好之后，点击导出就可以了。
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