I never knew you were such a jazz buff.

我从来不知道你是这样的爵士乐迷。

Abby also says that she didn't know Bill was such a " jazz buff."

艾比还说她不知道比尔是这样的“爵士乐迷” 。

To be a " jazz buff" (buff) means the same as a jazz fan – someone who likes jazz music.

成为“爵士迷” （buff）与爵士乐迷的意思相同——喜欢爵士乐的人。