機器
big
car
coal
construction
dig
dirt
dump
dumper
earth
ecology
environment
equipment
excavation
excavator
geology
gravel
heavy
industrial
industry
iron
large
load
machinery
metal
mine
mineral
mining
mover
nature
open
opencast
ore
pit
production
quarry
quarrying
rock
shovel
site
sky
stone
tractor
transport
transportation
truck
vehicle
wheel
work
yellow