英文關鍵字
barrier
border
boundary
chain
divide
division
edge
enclosure
fence
frame
gate
limit
limited
line
link
ownership
picket
property
protection
security
英文關鍵字
barrier
border
boundary
chain
divide
division
edge
enclosure
fence
frame
gate
limit
limited
line
link
ownership
picket
property
protection
security