| 词汇 | 久炼成钢 |
| 释义 | 久炼成钢久炼成钢[jiǔ liàn chéng gāng]1.■(Iron) in a long process of refinement by fire becomes steel -- so is a man purified and strengthened by training.; It takes plenty of tempering to produce fine steel.; Practice makes perfect. |
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