quaver

1. V-I If someone's voice quavers, it sounds unsteady, usually because they are nervous or uncertain. (声音)颤抖

Her voice quavered and she fell silent. 她的声音颤抖着，继而沉默了下来。

2. N-COUNT Quaver is also a noun. 颤音

There was a quaver in Lena's voice. 莉娜的声音中有颤音。

3. N-COUNT A quaver is a musical note that is half as long as a quarter note. 八分音符[英国英语]