英文關鍵字
aggregate
aluminum
bauxite
belt
chain
construction
conveyor
crushed
dust
equipment
excavation
factory
gravel
heap
industrial
industry
level
line
link
loading
machine
machinery
material
metallurgy
mine
minerals
mining
mixer
mound
occupation
ore
pile
pit
plant
production
quarry
raw
resource
silo
steel
storage
store
transportation
warehouse
working