um

嗯、呃表迟疑

Um, I'm not really sure how to answer that.

呃，我不太确定该怎么回答。

嗯、这个口语，表怀疑或委婉反对

Um, that's not exactly what I said yesterday.

嗯，我昨天说的其实不是这样。

支支吾吾、语塞声常用复数

Her speech was full of ums and long pauses.

她的演讲充满支支吾吾和长长的停顿。