機器
explosion
abstract
air
ash
atmosphere
backdrop
background
black
chemical
chemistry
cigarette
closeup
cloud
cloudiness
cloudy
collection
condensation
dark
design
dust
dynamic
effect
exhaust
explode
fog
fume
gas
graphic
gray
grey
illustration
isolate
light
mist
motion
nobody
pollution
realistic
smell
smog
smoke
smoky
soft
steam
toxic
transparent
vapor
white