英文關鍵字
aerial
coal
conveyer
drone
equipment
geology
granite
heavy
industrial
industry
iron
machinery
mine
mineral
mining
natural
ore
quarry
railway
road
summer
transportation
unloading
wagon
英文關鍵字
aerial
coal
conveyer
drone
equipment
geology
granite
heavy
industrial
industry
iron
machinery
mine
mineral
mining
natural
ore
quarry
railway
road
summer
transportation
unloading
wagon