英文關鍵字
chemical
city
damage
danger
dirt
dirty
disaster
discard
ecological
ecology
ecosystem
environmental
garbage
lake
pollution
pond
problem
river
rubbish
toxic
trash
urban
water
英文關鍵字
chemical
city
damage
danger
dirt
dirty
disaster
discard
ecological
ecology
ecosystem
environmental
garbage
lake
pollution
pond
problem
river
rubbish
toxic
trash
urban
water