機器
architectural
architecture
body
building
business
chemical
chemistry
chimney
construction
energy
engineer
engineering
environment
estate
exterior
factory
fuel
gasoline
hard
hat
helmet
industrial
industry
machinery
male
man
manager
manufacturing
metal
oil
part
petrochemical
petroleum
pipe
pipeline
plant
pollution
power
production
protect
protection
refinery
safety
storage
structure
technology
tower
tube
young
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