機器
activity
background
build
building site
bulldozer
city
civil engineering
concrete
construction
construction equipment
construction site
demolition
development
dig
digger
dirt
dozer
drilling
earth
earthmover
engineering
equipment
excavate
excavation
excavator
heavy
hydraulic
industrial
industry
machinery
metal
mover
quarry
road
road work
site
small excavator
smashing
soil
stone
technology
tool
transportation
vehicle
work
worker
workplace
yellow