Correct

旁听

/ pángtīng /
Strokes

Definition

to visit (a meeting, class, trial etc)

Example

As a Verb

be present at a conference/meeting as an observer

1
suī
shi
wěiyuánhuì
委员会
chéngyuán
成员
  
,
dàn
liúxiàlái
留下来
pángtīng
旁听
  

He stayed at the conference though he was not a committee member.

2
tíng
法庭
pángtīngzhě
旁听者

visitor attending a court trial

As a Verb

audit

3
yuánlái
原来
pángtīng
旁听
guò
de
  

He once sat in on my class.

4
zài
běijīngxué
北京大学
pángtīng
旁听
guò
  

He once audited classes in Peking University.