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为什么奥斯曼入侵巴尔干时东欧诸国没能形成有效抵抗？ - 知乎
source link: https://www.zhihu.com/question/332423109/answer/736304234
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谢邀，不过我不太精通15th以前的历史，不过还是可以说一下大概的历史。我会从1352年一直讲到莫哈赤战役。…
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