英文關鍵字
background
bad
bubbles
changing
contaminant
contamination
defilement
dirt
dirty
dirtying
discharge
ecology
environmental
eutrophication
falling
fan
floating
foam
foaming
froth
gentle
gutter
harmonically
head
issue
lather
matter
organic
organics
pattern
plume
polluter
process
produces
rapid
scum
sewage
soap
soft
soiling
spume
stochastic
stream
streams
suds
texture
topn
tracery
view
water
weightless