重垣叠锁

Explanation: Yuanqiang repeated, overlapping lock and key. Refers to the deep intrauterine Court, strict protection. 　　Source: Guo, "Wang Zhaojun" Act: "That marvelous them from their home, moved to the re-stacked wall to lock the house, their grief has to be unthinkable, and that they still know something is uncomfortable even more grief. "