機器
belt
blades
brown coal
coal
coal man
coal mine
coal mine excavator
collier
colliery
combustion
conveyor
current
digger
digging
dredge
dungeon
energy
engineering
excavator
exploitation
factory
geology
goldmine
industry
machinery
mine workings
miner
mineral
mining
mining industry
mining machinery
ore
pit
power
rock
rotating
sand
science
sinker
source
surface
wheel
work