英文關鍵字
brent
chemical
city
clean
corrosion
dirt
dirty
drain
drainage
dump
ecology
environment
environmental
flow
flowing
garbage
green
gushing
industrial
industry
liquid
nature
oil
outlet
pipe
pipeline
pollute
polluted
polluter
pollution
pouring
production
pump
river
sewage
sewer
sludge
smell
smelly
stream
toxic
treatment
tube
unclean
waste
wastewater
water
white