deb http://mirrors.163.com/debian/ buster main contrib non-free
deb http://mirrors.163.com/debian/ buster-updates main contrib non-free
deb http://mirrors.163.com/debian/ buster-proposed-updates main contrib non-free
deb http://mirrors.163.com/debian/ buster-backports main contrib non-free

deb http://mirrors.163.com/debian-security/ buster/updates main contrib non-free

# deb http://security.debian.org/debian-security/ buster/updates main contrib non-free

# deb http://deb.debian.org/debian/ buster main contrib non-free
# deb http://deb.debian.org/debian/ buster-updates main contrib non-free
# deb http://deb.debian.org/debian/ buster-proposed-updates main contrib non-free
# deb http://deb.debian.org/debian/ buster-backports main contrib non-free