#deb http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://raspbian.raspberrypi.org/raspbian/ stretch main contrib non-free rpi
deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi
deb http://mirrors.aliyun.com/raspbian/raspbian/ stretch main non-free contrib rpi
deb-src http://mirrors.aliyun.com/raspbian/raspbian/ stretch main non-free contrib rpi