她的声音微弱得几乎听不见，她低声说：“这所房子里没有人。”

With a voice so weak that it hardly could be heard, she whispered, "No one lives in this house."

youdao

他声音微弱得几乎听不到。

His weak voice was almost inaudible.

《柯林斯英汉双解大词典》

贝基声音微弱。

Becky's voice was weak.

youdao

In "Mowing," the scythe makes a sound as it cuts, and that sound is delicate, it's quiet, it whispers.

在“割草“中镰刀割草时发出声响，这个声音很微弱，安静，像低声细语。

耶鲁公开课 - 现代诗歌课程节选

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