英文關鍵字
blue
chimney
condensate
cool
cooling
cylindrical
ecology
electricity
energy
engineering
environment
environmental
equipment
factory
forest
gas
generate
generator
green
grass
great
heat
industrial
industry
lines
many
modern
network
plant
pole
pollution
power
river
sky
smoke
source
station
structure
sun
sunset
supply
system
technical
technology
transmission
tower
vapor
voltage
warming
water