It is ',' a duet sung by Susanna and the Contessa.

Chesoavezeffiretto’苏珊娜孔德萨的二重唱。

I sang a duet at a Karaoke bar.

在ok唱二重唱。

Do anyone want to sing a duet with me?

有没有人要跟我唱二重唱？

I sing with someone in duet.

我某人唱二重唱。