英文關鍵字
footage
background
screen
media
clip
concept
motion
digital
multimedia
presentation
pollution
reality
tall
chimney
air
water
vapor
smoke
environmental
issues
control
industrial
prevention
quality
emissions
pollutant
atmospheric
health
hazards
levels
greenhouse
gases
smokestack
sources
management
contamination
pollutants
impact
solutions
measures
effects
monitoring
particulate
matter
reduction
technology
devices