Correct

吮吸

/ shǔnxī / 
Strokes

Definition

to suck

Example

As a Verb

suck; suckle; absorb

1
Yīngér
婴儿
zhèngzài
正在
shǔnxī
吮吸
mǔqīn
母亲
de
的
rǔzhī
乳汁
  
。

The baby was suckling at its mother's breast.

2
Yòng
用
xīguǎn
吸管
shǔnxī
吮吸

suck with a straw

3
Shǔnxī
吮吸
mǔzhǐ
拇指

suck one's thumb

4
Shǔnxī
吮吸
gùyuán
雇员
de
的
xuèhàn
血汗

bleed the employees white