英文關鍵字
agua
body
canal
change
changing
chemical
climate
close
contamination
danger
destroying
dirt
dirty
disaster
drain
drainage
dump
ecological
ecology
environment
environmental
factory
falls
flowing
focus
garbage
illegal
industrial
industry
influence
life
natural
nature
pollute
polluted
polluting
pollution
problem
resource
river
rivers
sample
selective
sewage
stream
technology
theme
toxic
unhygienic
urban
waste
water