PHRASAL VERB 旁听(课程);列席(会议) 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. 旁听(课程);列席(会议)
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Will they permit you to sit in on a few classes?. [VERB PREP. PREP. noun]
他们会同意你旁听几节课吗？
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People can sit in on meetings, even if it's not really in their subject area. [VERB PREP. PREP. noun]
即使不在其研究专题范围之内，人们也可以列席会议。
SYN attend, watch, observe, be present at