英文關鍵字
air
building
chemistry
chimney
city
cloud
condensation
construction
day
distillation
dusk
energy
engineering
factory
fuel
fumes
gas
gasoline
generation
global
industry
nature
oil
outdoors
people
petrochemical
physical
pipe
pollution
power
sky
smog
smoke
stack
station
storage
structure
substance
sunlight
technology
tower
town
toxic
tube
warming