機器
background
blue
building
chemical
chemistry
chimney
company
construction
dawn sky
dusk
energy
environment
equipment
evening
factory
gas
heavy
industrial
industry
light bulb
liquid
manufacture
manufacturing plant
metal
monomer
nobody
old
petrochemical
pipe
pipeline
plant
pollution
polymer
production
reaction
reactor
site
sky
steel
storage
sunrise
sunset
tank
technology
tower
twilight
vessel
wall
work
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