如何修改R包内部函数，实现R包函数没有的功能
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| VIDEOS | |||
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 360P | Download |
| AUDIO | |||
| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
| THUMBNAILS | |||
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JPEG | Origin Image | Download |
如果R包的参数不能满足你的功能需求，可以修改内部函数以实现自己需要的功能，本教程门槛稍高，但可供学习的内容很多。R
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