英文關鍵字
army
background
barb
barbed
barrier
block
bob
border
boundary
cage
chain
closeup
construction
country
crime
danger
defense
enemy
fence
forbid
forbidden
freedom
guard
hostile
imprisoned
iron
isolated
jail
macro
military
motion
outdoor
prison
prisoner
private
protection
protective
refugee
rusty
safety
security
sharp
slow
spike
steel
stop
terrorism
thorn
war
warning
wire