機器
big
business
car
concrete
construction
development
digger
digging
dump
earth
environment
equipment
excavate
excavation
excavator
extraction
geology
granite
gravel
heap
heavy
industrial
industry
iron
loader
loading
machinery
manufacturing
metal
metallurgy
mine
mineral
opencast
openpit
ore
outdoor
output
pebble
quarry
rock
sand
sky
stack
stone
technology
transport
transportation
truck
vehicle