https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
conda config --set show_channel_urls yes
https://mirror.tuna.tsinghua.edu.cn/help/anaconda/