英文關鍵字
abyss
filled
sewage
fountain
torn
sewer
pipe
bottom
slow
motion
accident
broken
brown
city
culvert
damaged
danger
dirty
drain
drainage
ecology
environment
exploding
flood
flow
hole
insurance
manhole
old
open
outdoor
overflow
pile
pipeline
pit
problems
repair
road
rusty
sewerage
splashing
storm
stream
street
system
treatment
trench
tube
underground
urban
utility
waste
water
working