英文關鍵字
big
bulldozer
business
car
construction
danger
dig
digger
digging
dump
equipment
excavate
excavation
excavator
extraction
geology
granite
gravel
heavy
huge
industry
landscape
large
machine
machinery
mine
mineral
mining
mountain
nature
pit
power
quarry
quarrying
rock
shovel
soil
steel
stone
technology
tractor
transport
truck
working