fortification
/ˌfɔːtɪfɪˈkeɪʃən/noun
(常作fortifications)
1- a defensive wall or other reinforcement built to strengthen a place against attack防御工事; 防御城墙。
1.1
- mass noun the action of fortifying or process of being fortified筑城, 筑垒; 设防：
the fortification of the frontiers.
边境设防。
词源
late Middle English: via French from late Latin fortificatio（n-）, from fortificare （see FORTIFY）.