英文關鍵字
abandon
alarm
alert
atom
attention
background
beware
blinking
bomb
caution
computer
danger
dangerous
dirty
emergency
error
evacuate
evacuation
explosion
fail
fiction
flashing
hazard
illustration
information
licking
light
looping
monitor
nuclear
old
people
plane
plant
power
problem
radiation
radioactive
red
rediation
retro
safety
science
screen
seamless
security
ship
sign
signal
spaceship
station
symbol
system
unauthorized
vintage
warning
waste