I competed in the winter Olympics, which was my swan song.

我参加了冬季奥运会，那是我的告别比赛。

Tomorrow will be their swan song.

明天他们将举行告别演出。

This is his swan song.

这是他的绝笔。

This book is believed to he his swan song.

这本书被公认为他的最后一部作品。

This book is believed to be his swan song.

认为这本书是他的最后一部作品。