| 单词 | sit in on | 
| 释义 | sit in on phrasal verb   See full dictionary entry for  sit 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.   Will they permit you to sit in on a few classes? [VERB PARTICLE PARTICLE noun]   People can sit in on meetings, even if it's not really in their subject area. [VERB PARTICLE PARTICLE noun]   | 
	
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