Hadoop在mirrors中添加alimaven的下载源的操作方法和步骤是什么？

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<mirrors>
    <!-- mirror
     | Specifies a repository mirror site to use instead of a given repository. The repository that
     | this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used
     | for inheritance and direct lookup purposes, and must be unique across the set of mirrors.
     |
    
        <mirror>
        <id>alimaven</id>
        <mirrorOf>central</mirrorOf>
         <name>aliyun maven</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
        </mirror>
        <mirror>
        <id>mirrorId</id>
        <mirrorOf>repositoryId</mirrorOf>
        <name>Human Readable Name for this Mirror.</name>
        <url>http://my.repository.com/repo/path</url>
        </mirror>
     -->
</mirrors>