機器
brown
bulldozer
construction
cylinder
digging
dirt
ditch
electricity
energy
engineering
equipment
fabricate
field
fix
gas
industrial
industry
installation
iron
join
land
line
maintenance
manufacturing
metal
mud
occupation
oil
outdoors
pipe
pipeline
piping
power
preparation
repair
steel
technology
transportation
trench
tube
vehicle
weld
welder
worker
working
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