centos 执行yum 执行错误

1、在执行yum 命令是报一下错误 已加载插件：fastestmirror Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was 14: curl#6 - "Could not resolve host: mirrorlist.c

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