swan song

LONG LONG AGO ,THERE IS A STORY ABOUT SWAN. THE SWAN IS GENTLE AND BEAUTIFUL.THAT REMEMBER ME OF THE UGLY LITTLE DUCK.IT IS VERY CUTE AND LONGLY.IN FACT ,SWANS ARE ALWAYS seen to be ALONG. and you may not hear the song sung by them.it is not unusual.for them ,they only sing at the end of their life.yes,it is their last song .最后的挽歌