公爵夫人用低沉的、微弱的声音说。

The Duchess began in a low, weak voice.

youdao

走了一英里左右，皮诺乔又听到那个微弱的声音在低声说：“记住，小傻瓜！”

After a mile or so, Pinocchio again heard the same faint voice whispering: "Remember, little simpleton!"

youdao

他开始觉察到水滴下来的轻柔、微弱的声音。

He became aware of the soft, faint sounds of water dripping.

《柯林斯英汉双解大词典》

Suddenly they do the Doppler effect where they turn their backs to you, in a way, and they're marching away from you and you hear very little sound.

突然,他们也产生了多普勒效应,当他们转身背对你时,当他们背离你前进时,你会听到一种很微弱的声音

耶鲁公开课 - 聆听音乐课程节选