英文關鍵字
brown
bucket
building
bulldozer
business
construction
development
dig
digger
digging
dirt
dredger
earth
earthworks
engineering
equipment
excavate
excavation
excavator
extract
grab
hydraulics
industrial
industry
labor
ladle
loader
loading
machine
machinery
metal
mine
mining
pit
power
scoop
shovel
site
soil
stone
technology
tractor
transport
transportation
tree
trench
vehicle
work