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blue
sky
season
plant
energy
cable
electrical
power
line
winter
smoke
industry
ecology
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相似主題
英文關鍵字
blue
sky
season
plant
energy
cable
electrical
power
line
winter
smoke
industry
ecology
talk
support
heat
clouds
coil
pipe
distribution
steam
wiring
lowering
heating
insulators
emissions
transformers
power lines
high voltage
substations