Will they permit you to sit in on a few classes as an observer?

他们会允许你旁听几节课吗？

《柯林斯英汉双解大词典》

They decided to sit in on the discussion.

他们决定听一下这次讨论。

youdao

If possible, ask to sit in on a Daily Scrum.

如果可能，请求旁听一次每日scrum例会。

youdao

People also sit on the beach and on rocks in the fishing village of Menemsha to watch the sunsets.

VOA: special.2011.07.25

If any of you don't want your image recorded and posted on the web, you're supposed to sit in the back three rows.

如果你们中的任何一位,不希望被拍摄下来并被放到网络上，你们可以坐到后面三排去。

麻省理工公开课 - 计算机科学及编程导论课程节选

So I just sit in there and work on, work on the sounds that are hard for my English tongue to produce.

有一些和英语发音不同的地方让我感到很难，我会长时间地练习这些发音。

想学好英语吗？ - SpeakingMax英语口语达人

While there, he had the chance to sit in on the making of The Cosby Show.

CNN: ASIANOW - TIME Asia | Television: Uncanned Laughter

One day, his university class has the opportunity to sit in on a war-crimes trial.

ECONOMIST: The young writers�� holocaust

After Wilson married Galt, in December of 1915, she began to sit in on high-level meetings.

NEWYORKER: State of the Union