英文關鍵字
laborer
petroleum
well
installing
sample
explore
exploration
gas
rig
flow
motor
oil
petrol
return
drilling
offshore
install
helicopter
technological
industrial
sand
lubricant
dirt
hydraulic
drill
pit
mud
industry
technology
geological
coal
carving
sandstone
based
limestone
shaker
grate
heavy
caving
clay
lubrication
cutting
shale
water
claystone
fluids
holer
oilrig
silt