英文關鍵字
activity
backhoe
bucket
claw
construction
crawler
cylinder
digger
digging
digs
dredge
earth
earthwork
earthworks
engineering
equipment
excavate
excavation
excavator
ground
handling
heavy
hole
horizontal
hung
hydraulic
industrial
industry
labor
ladle
machine
machinery
pit
quarry
sand
shovel
site
snow
soil
vehicle
work