英文關鍵字
ray
beam
sun
shine
bright
sewarage
manhole
access
port
sewage
collection
system
underground
close
view
back
light
round
dirty
drain
concrete
sewerage
water
abandoned
inside
danger
drainage
service
industrial
environment
outflow
pipeline
stink
poison
human
sewer
stream
ecology
leak
flooded
tunnel
flow
wastewater
leakage