英文關鍵字
chemical
contaminate
contaminated
contamination
damage
dirty
disaster
drain
drainage
drainages
dump
ecology
environment
environmental
factory
fatal
flow
flowing
impurity
industrial
influence
leak
mud
pipe
pollutes
pipeline
poison
polluted
pollution
problem
river
rubbish
runoff
sanitary
sanitation
sewage
sewer
sludge
smelly
stench
stream
system
toxic
tube
waste
water
wastewater
white