懸樑刺股 (jyun4 loeng4 ci3 gu2, xuán liáng cì gǔ) — to study assiduously and tirelessly (idiom); see also 頭懸梁,錐刺股|头悬梁,锥刺股[tou2 xuan2 liang2 , zhui1 ci4 gu3]
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