root@instance-9 ~]# wget -c --no-check-certificate https://www.duoluosb.com/wp-content/uploads/2018/03/08/l2-2015.tar.gz--2020-02-12 07:25:17-- https://www.duoluosb.com/wp-content/uploads/2018/03/08/l2-2015.tar.gzResolving www.duoluosb.com... failed: No address associated with hostname.wget: unable to resolve host address “www.duoluosb.com”[root@instance-9 ~]# 出现这个问题，怎么解决？