機器
big
building
construction
crane
digger
dirt
dirty
earth
environment
equipment
excavator
extraction
geology
granite
gravel
grunge
heavy
huge
hydraulic
industrial
industry
loader
machinery
material
metallic
mine
mining
moving
nature
old
power
quarry
quarrying
rock
shovel
steel
stone
surface
technology
tool
transport
transportation
vehicle
water
work