Shēngqí yíshì lǐbì, xuéshēng men lùxù fǎnhuí jiàoshì.
After the flag-raising ceremony concluded, the students returned to their classrooms one after another.
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Highly formal, almost exclusively a ritual command. You'll hear it at flag-raising ceremonies, funerals, weddings, military reviews, and other formal events to mark the close of a procedure. Not used in conversation to mean 'I'm done.'
history
Classical pattern: 毕 means 'finish, complete' (compare 完毕 'completed' and 毕业 'graduate'). 礼毕 follows the verb-final word order of literary Chinese, hence its ceremonial flavor.
