顺便说

Could I just say in passing that … ?

我能顺便说下…吗？

Incidentally, I think you still owe me some money.

顺便说, 我想你还欠我钱。

By the way, the music at this event was played by a man with a cittern, who not only performed with virtuosity, but also with a sense of humour.

顺便说，动的音乐是被人用西特琴奏的，不仅很艺术，而且感觉有幽默。