機器
barrel
black
business
color
construction
dark
drill
ecology
economy
energy
environment
equipment
field
fossil
fuel
gas
gasoline
industrial
industry
jack
lightning
machinery
oil
oilfield
orange
petroleum
pipe
pipeline
platform
pollution
power
pump
reservoir
resource
rig
rocking
silhouette
sky
steel
stormy sky
sun
sunrise
sunset
supply
tank
technology
wealth
well