機器
activity
brown
bucket
bulldozer
car
clay
construction
day
development
digging
dirt
draw
earth
engineering
equipment
excavation
excavator
geology
green
ground
heavy
highway
industrial
industry
land
landscape
large
loader
machinery
material
mine
mineral
mining
outdoor
quarry
red
resource
sand
site
soil
surface
tractor
transportation
truck
vehicle
work
working
workplace
yellow