内三关
Three Inner Passes
以上为机器翻译结果，长、整句建议使用 人工翻译 。
明朝在“外边”长城之外，还修筑了“内边”长城和“内三关”长城。
Ming Dynasty in "outside" outside Great Wall, but also has constructed "in side" the Great Wall and "in three passes" the Great Wall.
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明代时以现今河北省境内沿内长城一路的居庸关、紫荆关、倒马关三关为“内三关”。
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