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