在阅览室里， 轻声说话， 以免打扰别人。

Talk softly in the reading room in order not to disturb others.

youdao

她低沉沙哑地轻声说话。

She spoke in a husky whisper.

《牛津词典》

“轻声说话”就是：头高高抬起，以一种自信的方式聊天。

There is the "speakeasy": the head is held high, in a self-confident way, chatting away.

youdao

I sometimes have trouble with students who talk very softly which is alright in itself and sometimes very sweet.

有时候有些同学说话轻声轻语,这样说话本身没什么,但我却有时听不太明白。

麻省理工公开课 - 电影哲学课程节选