To bury one's head in hard work; to work diligently and quietly without seeking attention.
专心一意地刻苦工作。
鲁迅《且介亭杂文·中国人失掉自信力了吗》我们从古以来，就有埋头苦干的人。”
She spent the whole summer buried in her studies, 埋头苦干 for the final exams.
Learn the next connected idiom: 埋头苦干 (mái tóu kǔ gàn) → 干净利落 (gān jìng lì luò)
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