英文關鍵字
additional
belt
bulk
cement
closeup
comminution
conveyor
dust
dusty
equipment
factory
fraction
gravel
gray
heap
industrial
industry
limestone
line
machinery
manufacture
material
materials
mining
motion
moving
plant
poured
pours
powder
processing
production
raw
resources
rock
stone
stones
technique
technology
transporter
uniform
work