rsync -avrt rsync://mirrors4.tuna.tsinghua.edu.cn/centos/ /mirror/centos/
#默认使用清华大学源
#Default Use Tsinghua University's Source
#此处为CentOS系统实例
#Here is an example of the CentOS system
#/mirror/centos/是本地目录
#/mirror/centos/ is the local directory