英文關鍵字
fence
security
barbed
wire
freedom
protection
military
steel
danger
metal
crime
prison
boundary
barb
barrier
sky
border
safety
silhouette
war
forbidden
wall
jail
law
private
secure
defense
criminal
escape
separation
violence
guard
prevent
army
camp
white
cage
arrest
crisis
conceptual
illegal
horror
loneliness
dissident
political
prisoner
protest
unattainable
sunset