swan song

例句：

1. 1. The swan sang its final song before flying away.
   天鹅在飞走前唱了它的最后一次歌。
2. 2.The orchestra played a swan song to honor the late composer.
   管弦乐队演奏了一首天鹅之歌，以纪念已故的作曲家。
3. 3. The swan's song was heard throughout the valley as it flew over.
   当天鹅飞过时，整个山谷都能听到它的歌声。