英文關鍵字
belaz
boulders
clay
coal
dust
equipment
excavator
industry
limestone
loading
miner
ore
quarry
rocks
sand
shovel
transportation
truck
work
worker
英文關鍵字
belaz
boulders
clay
coal
dust
equipment
excavator
industry
limestone
loading
miner
ore
quarry
rocks
sand
shovel
transportation
truck
work
worker