英文關鍵字
background
canal
city
clean
concrete
construction
dirty
discharge
drain
drainage
ecology
environment
environmental
filtration
flood
flow
flowing
grass
green
industrial
industry
nature
outdoor
outdoors
outflow
outlet
overflow
pipe
plant
pollution
rain
rainwater
resource
river
runoff
sewage
smelly
stream
surface
system
treated
treatment
tube
waste
wastewater
water
waterway