Something percolating. I don't know how to describe these. Recorded with a Google Pixel XL, as its bottom-facing (mono) microphone is perfect for this. No noise reduction.
percolating1.flac
聲道：1
類型：flac
gurgle、bubble、borborygmi、intestines、guts、liquid、groan、human、stomach、digestion、body
汩汩、氣泡、腹鳴、腸、膽量、液體、呻吟、人的、胃、消化、身體
資料來源：freesound ( https://freesound.org )