機器
aerial
air
alternative
angle
background
blue
building
clear
connector
construction
curve
day
dust
energy
engineering
environment
equipment
factory
filter
front
gray
heavy
high
industrial
industry
large
low
metal
pipe
pipeline
plant
polluted
ponds
power
silver
sky
smoke
stack
station
steel
tank
tanks
technology
tube
tubes
water
yellow
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