英文關鍵字
air
atmosphere
blue
chemical
chimney
city
cloud
coal
construction
disaster
ecology
emission
energy
environment
environmental
equipment
factory
gas
global
heavy
industrial
industry
iron
landscape
manufacturing
metallurgical
metallurgy
ore
pipe
pipes
planet
plant
pollution
power
production
sky
smog
smoke
smokestack
stack
steam
steel
technology
tower
toxic
train
wagons
white
world