英文關鍵字
aqua
border
bubbles
canalisation
canalization
contamination
day
drain
drainage
ecology
edge
floats
flow
foam
froth
hole
motion
muddy
outdoor
outfall
pollution
pouring
reflection
release
sewage
sewerage
spatter
stone
stream
superiorly
surface
top
turbid
view
wall
water
wave
wet
white