"Can you work overtime tonight?" "Hmm-mm," she murmured reluctantly, still staring at her phone.

Hmm-mm 是一个表示犹豫或不情愿的拟声词，通常用来表达勉强同意或含糊其辞的回应。这种发音方式通过鼻腔发出，带有不确定或敷衍的语气。