Chinese phrase
可以追溯退选〜吗？ ké yǐ zhuī sù tuì xuǎn 〜 ma
Meaning
Can I retroactively withdraw from ___?
When to use it
This asks if a past course can still be dropped. It is a polite question about making the change after the usual deadline.
Example dialogue
请问，可以追溯退选上学期的这门课吗？ qǐng wèn ké yǐ zhuī sù tuì xuǎn shàng xué qī de zhè mén kè ma
Excuse me, can I retroactively drop the course I took last semester?
要看情况，需申请并说明理由，由教务审批。 yào kàn qíng kuàng xū shēn qǐng bìng shuō míng lǐ yóu yóu jiào wù shěn pī
It depends. You need to submit an application, explain your reasons, and get approval from the academic affairs office.