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我想问一下为什么我们必须不直接获取物理地址(如果将其放置在逻辑地址中),而是首先从该段中获取段和该物理地址(在线性地址空间中)。为什么不直接来自Logical?是否不可能将 Dir|Table|Offset 地址仅放置在逻辑地址远指针中?