機器
environmental
barrel
bay
business
commercial
construction
crane
currency
derrick
drill
drilling
energy
engine
environment
equipment
exploration
fuel
gas
gasoline
generation
industry
large
light
mineral
moon
natural
nature
north
occupation
ocean
oil
petrochemistry
pipe
pipeline
plant
platform
pollution
power
pump
resource
rig
sea
silhouette
storm
technology
tower
water
wave
working