Her voice dropped to a whisper.

她压低声音小声说话。

《牛津词典》

Her voice sank to a whisper.

她的声音变成了耳语。

《牛津词典》

His voice dropped to a whisper.

他的声音已放低到轻声细语了。

《牛津词典》

Roosevelt's voice was very low, almost a whisper.

VOA: special.2010.09.16

These are dimensions of communication that I've been identifying in "Mowing" with the whisper of the scythe, that is, a tone of meaning or a way of meaning.

这是谈话的特点,这个是我在“割草“中提到的“,镰刀的低语，这就是，一种语调蕴含的意思或者是一种方式的意义。

耶鲁公开课 - 现代诗歌课程节选

I mean maybe up the street we whisper, but here we know it. And, so here is a different kind of system where we have a constant external pressure.

或许在街上你们低声细语，但在这里不应该这样，这是另一个系统,我们有一个恒定的外压强。

麻省理工公开课 - 热力学与动力学课程节选

This narrative, at times only a whisper or suggestion, weaves throughout my bodies of work.

CNN: 'Neighbors': Both anonymous and intimate

Viana was saying something, not in a whisper now, but as if muttering to himself.

NEWYORKER: While the Women Are Sleeping

Down, down, first to a mumble, then to a whisper, then to complete inaudibility.

NEWYORKER: Amundsen