英文關鍵字
bad
basic
brazilian
canal
cityscape
contaminated
contamination
degradation
dirt
dirty
drainage
faeces
feces
garbage
gutter
landscape
laying
nature
open
pipe
pipeline
pipes
plumbing
pollutant
polluted
pollution
river
rotten
sanitary
sanitation
sewage
sewer
sewerage
sewers
smell
stool
system
transportation
tubes
unsafe
urban
waste
wastewater
water
watershed