英文關鍵字
copper
pieces
ore
minerals
falling
conveyor
mining
industry
factory
machine
gangue
manufacture
rubble
automation
gravel
geology
industrial
quarry
shaking
stone
equipment
automated
fabrication
mechanized
rocks
granite
extracted
metallic
resource
relocation
geological
material
metal
mine
rock
mineral
transportation
work
fossil
coal
quarrying
bricks