機器
break
bucket
building
coming
concrete
construction
demolition
digger
dirt
dredger
effective
engineering
equipment
excavation
excavator
foundation
ground
hard
heavy
hydraulic
idle
industrial
industry
intermission
machinery
metal
mini
networks
nobody
outside
parked
power
safety
scoop
shovel
snack
soon
spoon
tank
timeout
tool
transportation
under
useful
utilities
vehicle
web
work
yellow