英文關鍵字
air
building
causes
change
climate
commercial
company
compounds
construction
contamination
damage
dirty
discharges
disease
drinking
drive
ecology
effects
environment
factory
global
harmful
hazard
health
industrial
industry
lake
layer
major
manufacturing
muck
natural
nature
object
ozone
pollutant
pollutants
polluter
pollution
problem
problems
product
production
quality
reflection
river
smoke
technology
toxic
tree
trees
warming
water