To be so engrossed in work or study that one forgets to eat, even when the day is far spent; to work diligently and indefatigably.
为了按时完成研究报告，他常常日昃忘食，废寝忘食地投入到资料整理中。
To complete the research report on time, he often worked diligently, forgetting to eat even as the day wore on, fully immersing himself in organizing the data.
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