英文關鍵字
accident
area
attention
background
ban
band
barrier
border
boundary
brown
caution
closed
closeup
crime
criminal
day
disaster
enter
forbidden
ground
hazard
interdictory
line
outdoors
outside
prohibit
prohibited
protect
protection
protective
red
restrict
restricted
ribbon
safe
safeguard
security
sign
stop
stripe
striped
sunny
swinging
symbol
tape
warning
white
wind
zone