機器
accident
african american
architect
architecture
background
builder
building
business
caucasian
civil
construction
contractor
crane
employee
engineer
engineering
entrepreneur
equipment
excavation
foreman
foundation
hard hat
hardhat
hat
heavy
helmet
industrial
industry
job
labor
machinery
male
man
manufacturing
men at work
occupation
outdoors
people
professional
safety
site
staff
technical
training
two
work
worker
working