機器
air
breathing
chemistry
clean
concept
construction
covid19
danger
dust
engineer
equipment
face
factory
fever
filter
foreman
gas
hardhat
health
healthy
helmet
hygiene
industrial
industry
job
machinery
man
mask
medicine
occupation
one
operating
person
pollution
portrait
protection
protective
respirator
safety
uniform
virus
warehouse
wearing
white
work
worker
workshop
yellow