英文關鍵字
aerial
aroma
beach
blue
channel
chemical
chemistry
damage
danger
dirty
drainage
ecology
environment
factory
flow
fuel
green
groove
industry
kissing
lake
litter
marine
nasty
natural
nature
nautical
ocean
oil
persistence
petroleum
pipelines
pipes
plastic
pollution
problem
river
sea
sewer
shore
smell
sneaky
surroundings
trash
travel
view
water