to participate as a visitor or observer
to be a substitute
to stage a sit-in
(often + on) to participate as a visitor or observer
He sat in on our group discussion
(+ for) to stand in for somebody
| 单词 | sit in |
| 释义 | sit inverb intransto participate as a visitor or observer to be a substitute to stage a sit-in (often + on) to participate as a visitor or observer He sat in on our group discussion (+ for) to stand in for somebody |
| 随便看 |
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