Correct

咕嘟

/ gū dū /
Strokes

Example

As an Onomatope

bubble; gurgle

1
Quánshuǐ
泉水
咕嘟
咕嘟
de
wǎng
wài
mào
  

The spring kept bubbling up.

2
Guō
de
shuǐ
咕嘟
zuōxiǎng
作响
  

The boiling water bubbled in the pot.