英文關鍵字
water
contaminate
problems
disaster
ecology
smelly
drain
poison
refinery
pollution
tube
dirty
flowing
canal
stream
chemical
global
factory
liquid
substance
toxic
plant
pipeline
pipe
fatal
influence
waste
warming
river
unhygienic
harm
industry
garbage
dump
sewage
sewer
outdoors
black
drainage
nature
environment
natural
day
runoff