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    1. deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib
    2. deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib
    1. deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui

    https://zhuanlan.zhihu.com/p/98079246