Correct

嘤嘤

/ yīng yīng / 
Strokes

Example

As an Onomatope

(of birds) sing; chirp

1
Niǎo
鸟
míng
鸣
yīngyīng
嘤嘤
  
。

Birds chirp.

As an Onomatope

sob

2
Tā
她
shuō
说
zhāo
着
shuō
说
zhāo
着
  
,
yīngyīng
嘤嘤
de
地
kū
哭
le
了
qǐlai
起来
  
。

As she spoke, she began to sob.