英文關鍵字
accident
breach
break
breakthrough
broken
bubble
canalization
concrete
crack
damp
delve
drain
drainage
dump
ecology
environment
fault
flow
fountain
fracture
froth
gap
hole
humid
industry
jet
liquid
motion
nobody
noone
overflow
pipe
pollution
pour
problem
puddle
red
runoff
rupture
rusty
sewer
sewerage
sink
spatter
stream
system
urban
waste
water
wet