機器
black
business
closeup
crude
detail
dig
dirt
dirty
drill
drilling
engineering
equipment
extract
facility
flow
ground
grunge
grungy
heavy
hole
industrial
industry
machinery
manhole
metal
mine
offshore
oil
oilly
oilwell
pipe
pipeline
pressure
produce
production
pump
pvc
rough
structure
tank
thai
thailand
trench
tube
water
well
work