機器
background
blue
coal
dig
dirty
dust
earth
energy
engineering
environment
equipment
excavation
excavator
exploitation
factory
front
generation
geology
gravel
heap
heavy
industrial
industry
lake
large
machinery
material
mine
mineral
move
mover
nature
ore
outdoors
pit
pond
power
raw
rock
sand
site
soil
stone
technology
truck
vehicle
working