It is pretty certain that you have heard a soft crackling noise.

我们所能听到的只是一些模糊不清的劈啪声，咕嘟声和嘶嘶声。

youdao

You may also like to note that when the cream begins to separate you can actually hear it give off a crackling noise.

您可能还要注意，当奶油开始分开时，可以听见它释放出噼啪声。

youdao

"This crackling noise seemed to be running through the field and the crop was moving gently, close to where the noise was."

那破裂的声音似乎穿过田地，噪声附近的作物微微晃动。

youdao

Brian Dodson said he was walking around 50m away on Sunday when he heard "a really weird crackling noise".

BBC: Cambridgeshire paraglider hits overhead electric cables

And just a crackling noise.

CNN: Navy jet has 'catastrophic mechanical malfunction,' hits apartments in Virginia