機器
architect
background
backhoe
builder
building
civil
construction
contractor
earth
employment
engineer
engineering
equipment
excavation
excavator
gravel
hand
hardhat
heavy
helmet
industrial
industry
job
loader
machinery
male
man
manual
occupation
outdoors
people
person
professional
protection
quarry
safety
sand
site
technology
tool
tractor
truck
vehicle
wheel
white
work
worker
workers
yellow