英文關鍵字
area
atmosphere
background
blue
building
chimney
city
climate
cloud
clouds
co2
construction
damage
dirty
dryer
ecology
elevator
emission
energy
engineering
environment
environmental
equipment
factory
fog
fuel
global
grain
hangar
heavy
industrial
industry
iron
landscape
large
manufacturing
metal
metallurgy
nature
old
pipe
pipes
plant
pollution
power
production
silo
sky
smog
smoke
steam
steel
structures
technologic
tower
toxic
vapor
warming
white