To study with extreme diligence and self-discipline, often enduring hardship; to apply oneself assiduously to one's studies.
他为了在学业上取得突破，每日悬头刺骨，废寝忘食地钻研。
To achieve a breakthrough in his studies, he applied himself with extreme diligence and self-discipline every day, often forgetting to eat or sleep.
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