機器
attention
care
caucasian
confidence
contractor
control
dirty
duty
engineer
engineering
equipment
facility
factory
foreman
handsome
hardhat
heavy
helmet
industrial
industry
job
labor
labor day
looking
machinery
maintenance
manufacture
manufacturing
mechanical
monitor
people
person
plant
portrait
problem
production
professional
safety
serious
site
technician
watching
welfare
work
worker
workplace
workshop
young