機器
air
arabic
area
biomass
business
chemical
chimney
chips
climate
construction
crane
danger
desert
diesel
east
ecology
energy
engineering
environment
factory
gas
gasoline
global
harbor
hydrogen
industry
oil
oxygen
pipe
pollution
port
power
refinery
silhouette
sky
smog
smoke
steam
structure
sunset
tanker
technology
timber
tower
toxic
tube
urban
water
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