機器
collar
construct
danger
diamond
electric
engineering
equipment
expertise
factory
goggles
grinder
grinding
hand
heat
heavy
helmet
horizontal
indoor
industrial
industry
instrument
job
labor
laborer
manual
manufacture
manufacturing
mechanic
men at work
metal
occupation
people
power
production
profession
protection
protective
repairman
safety
spark
steel
technical
technology
tool
work
worker
working
workshop
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