英文關鍵字
background
beach
black
canal
chemical
clay
coast
concrete
conduit
corrosion
dig
dirty
drain
drainage
dry
dump
ecology
environment
environmental
factory
floating
flow
flowing
fluid
garbage
generation
gushing
hole
industrial
industry
iron
join
liquid
metal
mud
ocean
old
outdoor
pipe
pipeline
polluted
polluter
pollution
pouring
repair
river
round
rust
rusty
sea
seascape
sewage
sewer
sewerage
sky
sluice
soil
stagnant
steel
stream
substance
surf
toxic
treatment
tube
two
unclean
waste
wastewater
water