Fortification
01
防御工事, 防御结构
a defensive structure or system constructed to protect an area or position from enemy attacks, typically including walls, towers, and other defensive elements
02
强化, 堡垒化
the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)
03
防御工事
the art or science of strengthening defenses



























