英文關鍵字
gears
mechanism
hand
symbol
sign
yellow
animated
movie
motion
looped
video
attention
risk
safety
exclamation
danger
caution
hazard
injury
information
mark
message
factory
worker
production
conveyor
repair
equipment
warning
alert
excitement
secure
alarm
beware
careful
signal
fatal
industry
construction
pressure
problem
protection
precaution
damage
isolated
white
cartoon
background
flat
man
reaches
for
working