sit in on

柯林斯词典

sit in on (sitting,sat,sits)

• 1. PHRASAL VERB If you sit in on a lesson, meeting, or discussion, you are present while it is taking place but do not take part in it. 列席; 旁听

  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？

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