The images of wild ducks on the stamps have already brought in hundreds of millions of US dollars. If each stamp represents a duck's life, then one could say that the sacrifice which ducks have made for conservation work is tremendous.
鴨票上的野鴨肖像已賺進數億美元，一張張鴨票換算成一隻隻野鴨，鴨族為生態保育工作，貢獻可謂良多。