機器
aerial
bulldozer
business
career
coal
construction
copper
cyprus
deep
diamond
dig
digger
dump
ecology
energy
engineering
environment
equipment
excavate
excavation
excavator
extraction
geology
gold
grab
ground
heavy
hill
huge
industrial
industry
iron
land
loader
machinery
mine
mineral
mining
quarry
quarrying
raw
resourse
stone
technology
transportation
truck
underground
view
work