機器
air
barrel
broken
bulb
car
chemical
chimney
collection
concept
contamination
convertible
decorative
design
disposal
earth
ecology
elements
emblem
energy
environment
factory
garbage
gas
hazardous
icons
illustration
isolated
leak
nuclear
object
oil
plant
plastic
point
pollution
power
radioactive
recycling
set
sign
smoke
symbol
toxic
truck
waste
water
world
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