英文關鍵字
architecture
armed
armor
armored
armoured
army
artillery
autumn
barrel
bastion
battery
battle
bunker
caterpillar
citadel
complex
conflict
construction
crimea
equipment
fighting
forces
fort
fortification
fortress
gun
heavy
historic
history
iron
lowering
machine
machinery
manual
metal
military
navy
old
power
protection
steel
war
weapon
wheel