HSK C7-9
Correct

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Strokes

Definition

(onom.) for humming or whimpering

Example

As an Onomatope
toot; hoot; zoom
1
Huǒchē
火车
fēichí
飞驰
ér
guò
  

The train tooted/zoomed past.

2
de
呜呜
lai
起来

begin to whimper with fear

3
呜呜
de
méiwán
没完

sob away uncontrollably