英文關鍵字
activity
backhoe
big
bucket
bulldozer
construction
development
dig
digger
digging
dirt
earth
equipment
excavate
excavating
excavation
excavator
gravel
ground
heavy
hydraulic
industrial
industry
large
loader
machine
machinery
metal
mine
mining
mover
open
ore
outdoors
power
quarry
rock
sand
scoop
shovel
site
soil
tractor
transport
transportation
truck
vehicle
work
working
yellow