英文關鍵字
aggregate
agriculture
ballast
band
bank
belt
bing
carrier
charging
construction
conveyance
conveyer
conveyor
dumping
engineering
equipment
extractive
factory
fertilizers
granulated
granules
indoor
industrial
industry
interior
line
long
machine
machinery
manufacturing
material
mine
mineral
nobody
plant
production
road
rock
saltpeter
sand
stone
strip
technology
tipping
track
transport
truck
vehicle
warehouse
work