英文關鍵字
action
background
blue
business
clouds
cloudscape
concept
coveralls
crude
drill
drilling
energy
engineer
equipment
extraction
field
fuel
gas
hardhat
helmet
industrial
industry
jack
job
labor
laborer
machine
machinery
man
metal
mining
occupation
occupational
oil
outdoors
passing
pipe
pipeline
power
production
professional
protection
pump
raw
red
refinery
resource
rig
safety
silhouette
sky
technician
technology
tool
valve
well
work
worker
working
writing