機器
big
bulldozer
car
coal
construction
copper
dirt
dump
dust
earth
energy
environment
equipment
excavate
excavation
extreme
filling
gear
glade
gold
ground
growth
heavy
highway
hydraulic
industry
iron
land
lane
level
machinery
metal
mine
mineral
open
ore
pit
quarry
rock
silver
sky
soil
stone
terrace
transport
transportation
truck
vehicle