英文關鍵字
antenna
architecture
army
artwork
base
border
boundary
building
cabin
camp
concentration
concept
control
convoy
creative
dark
decoration
detention
eerie
evening
facility
focus
frontier
guard
guardpost
high
hill
industrial
jail
lookout
military
moon
night
observation
outpost
patrol
penitentiary
post
prison
protection
safe
safety
security
selective
silhouette
stand
state
station
structure
surveillance
tower
view
war
warning
watch
watchtower
wooden