旁听的英文：
be a visitor (at a meeting, class, trial, etc)

参考例句：

She audited classes at the University of California.
她旁听加利福尼亚大学课程。

The Press were not allowed to attend the trial.
新闻界人士不得出庭旁听.

Don't audit life. Show up and make the most of it now.
不要旁听生命，从现在起就展示和做最好的自己。

The little colloquy between mother and son, did them some slight service in the opinion of the audience
那母子间小小的对话，在旁听的者看来对他们产生了一些用处。

visitor是什么意思：
n. 访问者；参观者；游客

The visitors are touched by the grandness of the monument.
游客们被纪念碑的雄伟所感动。

She introduced the visitors into the hall.
她把参观者引进大厅。

Visitors crowded the gallery.
参观者挤满了艺术馆。

meeting是什么意思：
n. 会议，集会；会见；运动会
v. meet的现在分词

They boycotted the meeting.
他们拒绝参加那个会议。

Nice to meet you. Nice to meet you, too.
很高兴认识你。 我也很高兴认识你。

Nice to meet you. Nice to meet you, too.
很高兴认识你。 我也很高兴认识你。

class是什么意思：
n. 班级；阶级；种类
v. 分类；把…分等级
adj. 很好的

It is a step class.
这是踏板操训练班。

The class dismissed.
下课了。

The class teacher sectioned the class for dialogues.
老师把班级分组进行对话练习。