英文關鍵字
ablutions
bank
confluence
creek
dirty
discharges
dishwater
drain
drainage
drainpipe
drumly
ecology
effluents
environment
flood
flow
greywater
grunge
industrial
liquid
melting
messy
mud
muddy
nature
outflow
pipe
pollute
riverside
rubbish
sediment
sewage
toxic
turbid
ugly
unhygienic
water