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英文關鍵字
red
blue
object
nobody
horizontal
isolated
sky
side
sign
travel
outdoors
transport
transportation
danger
border
End
car
driving
traffic
symbol
text
clear
pole
information
street
clouds
auto
highway
safety
forbidden
crossing
direction
warning
freeway
signal
stop
halt
intersection
post
octagon
terminate
road sign
stop sign
time lapse