英文關鍵字
big
carbon
coal
dig
digger
digging
dirt
dirty
dump
dust
earth
energy
engineering
equipment
excavate
excavation
excavator
extraction
fuels
heap
heavy
huge
industrial
industry
iron
labour
land
large
load
loading
lorry
machine
machinery
mine
mineral
mining
mover
pollution
power
quarry
strength
transportation
truck
vehicle
wheels
working
works
yellow