英文關鍵字
city
contaminated
contamination
danger
dirtiness
dirty
discharge
ditch
drain
drainage
drink
ebb
ecology
effluent
environment
environmental
foulness
glass
grip
impurity
industrial
industry
leakage
liquid
mouth
nature
oil
outflow
pile
pipe
pipeline
poison
poisonous
pollute
pollution
river
sanitary
scum
sewage
sewer
sewerage
spout
technology
tile
town
toxic
trench
tube
waste
water