機器
activity
bucket
building
construction
danger
dangerous
dig
digger
dirt
engineering
equipment
excavation
gravel
hard
hole
hydraulic
industry
job
loader
machinery
material
mover
moving
occupation
outdoor
outside
process
profession
repair
road
roadwork
roadworks
rock
safety
shovel
steel
street
structure
technology
tool
tractor
traffic
transport
transportation
truck
vehicle
vibration
work
worker