機器
afraid
anxiety
attack
blank
business
button
circle
click
concept
danger
dangerous
electronic
emergency
empty
factory
fear
filter
frightened
grunge
grungy
industrial
industry
machinery
metal
nervous
panic
photo
plastic
press
push
rapid
reaction
red
retro
round
safety
scared
service
stop
stress
stressed
symbol
text
urgency
urgent
word
worn
worry