英文關鍵字
automatic
belt
clay
coal
construction
conveyor
dirt
distribution
equipment
factory
gravel
heap
heavy
indoors
industrial
industry
large
line
long
machine
machinery
manufacture
manufacturing
material
metal
mine
mineral
motion
moving
order
plant
power
production
quarry
raw
rock
roller
row
rubber
sand
stone
storage
strip
supply
technology
transport
transportation
warehouse
work