英文關鍵字
are
bank
biological
burst
change
chemical
clean
climate
conservation
contamination
danger
dirty
drain
drainage
dump
ecology
effluent
environment
environmental
flood
flow
flowing
foam
garbage
industrial
industry
irrigation
liquid
mountain
nature
oil
outlet
overflow
pipe
pipeline
plant
pollutant
pollute
pollution
poured
pouring
pump
river
sanitary
sewage
sewer
sewerage
stream
system
toxic
treatment
tube
video
waste
wastewater
water