機器
and
barrel
black
blue
business
cloud
construction
crude
derrick
diesel
drill
drilling
ecology
energy
environment
equipment
exploration
fields
fuel
gas
gasoline
generation
industrial
industry
jack
manipulation
natural
oil
orange
petroleum
pipe
pipeline
plant
power
pump
refineries
resource
rig
rocking
silhouette
sky
storage
sun
sunrise
sunset
supplies
technology
the
well