英文關鍵字
brown
bulldozer
construction
crane
cylinder
digging
dirt
ditch
electric
electricity
energy
engineering
equipment
fabricate
field
fix
gas
helicopter
industrial
industry
installation
iron
land
line
machine
maintenance
manufacturing
metal
mud
occupation
oil
oilfield
outdoors
pipe
pipeline
pipes
piping
power
preparation
repair
steel
technology
transportation
trench
tube
vehicle
welder
welding
worker
working