High ramparts and deep moats; an impregnable or strong defense; solid fortifications.
为了保护珍贵的文化遗产，博物馆修建了高垒深堑般的安保系统。
To protect the precious cultural heritage, the museum established a security system like high ramparts and deep moats.
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High ramparts and deep moats; an impregnable or strong defense; solid fortifications.