機器
abstract
backdrop
background
banner
black
border
bright
collection
construction
decoration
derrick
drill
drilling
earth
energy
equipment
evening
festival
flare
flash
fossil
fuel
gas
gasoline
globe
illustration
industrial
industry
jack
natural
night
oil
oilwell
orange
pipeline
refinery
rig
silhouette
spark
star
sun
sunset
technology
well
white