機器
activity
background
backhoe
bore
borehole
boring
building
clay
concrete
construction
construction site
development
digging
dirt
dredger
drill
drill pipe
drilling
earthworks
engineer
engineering
equipment
excavation
excavator
foundation
freeway
gravel
heavyduty
highway
highway construction
hydraulic
industrial
industry
machinery
mining
mover
process
quarrying
road
rotary drill
soil
structure
technology
tools
tractor
transportation
vehicle
working
workplace