旧毛衣上总是沾满了绒毛。

The old sweater was covered in ___fluff.

这场谈话内容很空洞，全是些无关紧要的闲话。

The conversation was all ___fluff, just trivial chit-chat.

他在弹奏钢琴时不小心弹错了几个音符。

He ___fluffed a few notes while playing the piano.