英文關鍵字
action
activity
arm
backhoe
bucket
bulldozer
business
clay
construction
dig
digger
dust
earth
earthwork
equipment
excavate
excavation
excavator
gravel
ground
heap
heavy
house
hydraulic
industrial
industry
large
loader
machine
machinery
operate
pile
power
quarry
rugged
running
scoop
shovel
site
soil
technology
tree
vehicle
work
working
yellow