1, Athena Chu
2. Introduction: Bunker is a proper term in ancient military, which refers to a military defense building built of wood, iron or concrete.
3. The bunker is a solid building for military defense, which is made of brick, stone, reinforced concrete, etc. Bunkers have different functions in different countries, taking Germany as a refuge; The former Soviet Union is the storage place; Countries such as Japan are bastions of military inspection.
4. Bunker construction is an objective problem. In all kinds of armed conflicts and terrorist attacks, a safe haven that can provide reliable security protection has always been the goal pursued by ordinary citizens and even defenders.