機器
activity
arm
backhoe
big
bucket
building site
busy
civil engineering
contractor
crawler
dig
digger
dredger
earth
earthmover
earthwork
excavate
excavation
excavator
excess
ground
heavy
heavy duty
hydraulic
industrial
industry
job
loader
machinery
manage
operate
pickup
powerful
process
scoop
shovel
site
soil
spoon
steel
surplus
track
tracked
tractor
trench
work
workforce
workplace
yellow