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英文關鍵字
nobody
closeup
equipment
sign
plant
risk
action
light
danger
dangerous
industrial
machine
symbol
industry
emergency
working
optical
drawing
attention
busy
laboratory
security
manufacturing
in
flash
system
warning
conceptual
signal
machinery
of
alert
blinking
a
or
flashlight
to
an
flashing
beckoning
indicating
related
risks
no people
eye catcher
on off