centos使用yum报错"Could not resolve host: mirrorlist.centos.org; 未知的错误"

centos使用yum -y install报错"Could not resolve host: mirrorlist.centos.org; 未知的错误" Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was 14: curl#

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