[root@LYR ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/r
epo/Centos-8.repo--2021-05-22 07:56:21-- http://mirrors.aliyun.com/repo/Centos-8.repo
Resolving mirrors.aliyun.com... failed: Name or service not known.
wget: unable to resolve host address “mirrors.aliyun.com”
[root@LYR ~]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://developer.aliyun.com
/repo/Centos-8.repo--2021-05-22 08:05:27-- http://developer.aliyun.com/repo/Centos-8.repo
Resolving developer.aliyun.com... failed: Name or service not known.
wget: unable to resolve host address “developer.aliyun.com”
执行代码“ wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/r
epo/Centos-8.repo”后，出现错误提示：wget: unable to resolve host address “mirrors.aliyun.com”是怎么回事啊，请大佬赐教~~
