機器
activity
asphalt concrete
background
bulldozer
closed
concrete
construction
development
dig
digger
digging
dump truck
engineering
equipment
excavating
excavation
excavator
field
forklift
grass
gravel
green
ground
heavy
highway
industrial
industry
land
loader
machinery
maintenance
motor grader
motorway
mound
paver
pressure
public
reconstruction
repair
road
sand
shovel
soil
tractor
truck
truck crane
vehicle
wheel
work