機器
bulldozer
contractor
dig
dig up
earth
examining
excavation
ground
heavy
helmet
if you
industry
inspecting
inspector
job
land
large
machinery
maintenance
male
management
manager
mechanic
mechanical
move
moving
occupation
operating
operation
operator
person
power
powerful
professional
protection
protective
safety
technician
transport
transportation
truck
vehicle
vest
work
worker
working
workman
workplace