Translation of "sit in" - English-Mandarin Chinese dictionary

sit in

(BE PRESENT) 列席 phrasal verb with sit /sɪt/ verb (present tense sitting, past tense and past participle sat)

to be present in a meeting or class, watching it but not taking part in it

列席;旁听
There will be a school inspector sitting in on your class this morning. 今天上午将有一名督学来听你的课。

(Translation of “sit in phrasal verb, verb (BE PRESENT)” from the Cambridge English-Chinese (Simplified) Dictionary © Cambridge University Press)