英文關鍵字
beautiful
bionomics
consequences
construction
contamination
countryside
damage
defilement
ecology
emissions
environment
factory
forest
grass
green
harm
hazardous
impurity
industry
inflow
lake
landscape
metal
natural
nature
outdoor
perith
plant
pollute
polluted
pollution
production
reeds
river
season
source
stones
stream
summer
tree
trees
yellow