機器
activity
big
bulldozer
coal
construction
conveyor
crane
digging
dirt
dirty
dust
earth
energy
environment
equipment
excavator
exploration
extraction
extreme
factory
fuel
geology
global
gravel
grunge
heavy
huge
industrial
industry
machinery
metallic
mine
mineral
mining
moving
ore
power
quarry
quarrying
rock
steel
stone
technology
tool
transport
transportation
truck
vehicle
work