根目录
gēn mù lù
哦，这个词很实用！
"根目录"就是一个系统或文件夹结构里最顶层的那个位置，所有其他文件夹都从这里开始。"根"的意思是"根"，就像树根一样，是最底下、最基础的那个点。
你可以这样想：你的电脑里有很多文件夹，但所有文件夹都住在一个"大家长"里面，那个大家长就是根目录。
比如你在聊网站的时候，朋友可能会说："把这个文件放在根目录下面。" 意思就是放在最顶层，不要放进任何子文件夹里。
或者有人说："这个错误是因为根目录里缺少一个文件。" 就是说最顶层的位置少了什么东西。
在手机或电脑上，根目录通常是像 `/` 或者 `C:\` 这样的地方。
总的来说，根目录就是整个文件系统的"起点"，是最高层的那个位置。
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