deb http://mirrors.ustc.edu.cn/debian bullseye main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian bullseye main contrib non-free
deb http://mirrors.ustc.edu.cn/debian-security bullseye-security main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian-security bullseye-security main contrib non-free
deb http://mirrors.ustc.edu.cn/debian bullseye-updates main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian bullseye-updates main contrib non-free
deb http://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free
deb-src http://mirrors.ustc.edu.cn/debian/ bullseye-backports main contrib non-free
deb [signed-by=/usr/share/keyrings/onlyoffice.gpg] https://download.onlyoffice.com/repo/debian squeeze main
deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_20.x bullseye main
deb-src [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_20.x bullseye main
deb [signed-by=/usr/share/keyrings/waydroid.gpg] https://repo.waydro.id/ bullseye main
deb https://dl.yarnpkg.com/debian/ stable main