英文關鍵字
backhoe
bulldozer
coal
dig
digger
duty
earth
eathmoving
equipment
excavation
excavator
heavy
industry
large
machine
machinery
mine
mining
mover
pit
quarry
technology
truck
vehicle
vehicles
work
英文關鍵字
backhoe
bulldozer
coal
dig
digger
duty
earth
eathmoving
equipment
excavation
excavator
heavy
industry
large
machine
machinery
mine
mining
mover
pit
quarry
technology
truck
vehicle
vehicles
work