Explanation: Cast-iron ink stone is worn out. Described as determined unwavering, tireless. Source: Yuan Wang Shih-fu, "The West Chamber" First off the first [Mixed Martial Law] to the "poem" "books" by the mass, silverfish like no fee study. Keep warm around the spine, the iron Yan worn out. "
No. 2
The cast-iron of the ink-stone is worn out of. Analogy to study hard, have perseverance.
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No. 3
Cast-iron in the ink-stone has been worn out. Described as determined unwavering, tireless persistence. Ming Wang Yufeng, "incense in mind to see list": "Uzbek people struggle yarn hair envy, Notice of iron ink stone worn out." See also "worn out iron ink stone."