centos 執行yum 執行錯誤

1、在執行yum 命令是報一下錯誤 已加載插件：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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