She is cramming for tomorrow's exam.

她正为明天的考试而临急抱佛脚。

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cram本指塞满，在口语中cram也有为应考而死记硬背，为某个考试而死记硬背是用介词for.He crammed this clothe into the small box.他把衣服塞进那小箱子里。