機器
adult
business
caucasian
control
elder
employee
engineer
engineering
equipment
facility
factory
hard hat
hardhat
helmet
industrial
job
machinery
maintenance
male
man
manager
manufacturing
mechanic
men at work
metal
occupation
officer
old man
operator
person
plant
portrait
power
production
professional
protection
safety
senior
service
skill
smiling
standing
steel
technician
technology
work
worker
workshop
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