fortifications that made the frontier inviolable.
边疆上牢
可破
防御工事
fortifications that made the frontier inviolable.
边疆上牢可破防御工事
The fortifications were out of repair.
防御工事年久失修。
the most enormous complex of fortifications in all Islam.
整个穆斯林世界中最庞大联合防御体系。
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