英文關鍵字
action
air
atmosphere
background
bergheim
bucket
chimney
cloud
coal
contamination
digger
digging
distant
electricity
elsdorf
energy
environment
excavation
excavator
fired
fossil
fuel
fumes
gas
germany
industrial
industry
large
lighting
machine
machinery
mine
mining
natural
nobody
open
people
pit
plant
pollution
power
real
shot
site
sky
smog
smoke
smokestack
stack
station
steam
technology
time
tower
toxic
warming
wheel
working