機器
big
builder
building
bulldozer
caterpillar
city life
construction
day
development
dig
digger
dirt
driving
earth
equipment
excavation
excavator
heavy
highway
industrial
industry
loader
machinery
nature
no people
occupation
outdoors
power
road
road construction
rural road
safety
track
tractor
traffic
transport
transportation
truck
urban
vehicle
work
work place
worker