名詞 fortification:

1. defensive structure consisting of walls or mounds built around a stronghold to strengthen it
   同義詞：munition
2. the art or science of strengthening defenses
3. the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)

1. These fortifications were built during the last war.
   這些防御工事是上次戰(zhàn)爭時修建的。
2. This is a plan for the fortification of the city.
   這是一個加強城市防御的計劃。

for.ti.fi.ca.tion

n.Abbr. fort.,ft.（名詞）縮寫 fort.,ft.

The science of fortifying.
筑城學
The act or process of fortifying.
筑城：筑城的行動或步驟
Something that serves to fortify, especially military works erected to fortify a position or place.
防御工事：用于筑城的東西，尤指采取軍事行動防御一個位置或地方