英文關鍵字
accident
advice
alarm
alert
animation
attention
background
beware
careful
cartoon
construction
danger
design
error
exclamation
failure
forbidden
hazard
icon
illustration
important
industry
information
isolated
mark
message
mistake
motion
orange
precaution
problem
prohibition
red
risk
road
safety
secure
security
sign
signal
stop
style
symbol
traffic
triangle
triangular
warn
web
white
yellow