機器
arid
barrel
barren
counterweight
crude oil
eccentric
equipment
extract
extracting
extraction
field
frame
hydrocarbon
industrial
machinery
mechanical
mechanism
mining
nodding
oil
oil extracting
oil industry
oil production
oil well
oilfield
oilwell
petroleum
pump
pumping
pumping unit
pumpjack
resource
rocking
rocking chair
service
steppe