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万里の長城の秘密 |上から見た古代中国 | 写真ナショナル・ジオグラフィック
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万里の長城は実際にどれほど役に立ったのでしょうか?
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中国の万里の長城 - 現代世界の七不思議 - 歴史の中であなたを見てください
