Characters

• 百 (百): surname Bai
• 炼 (煉): to refine; to smelt
• 成 (成): surname Cheng
• 钢 (鋼): steel

Resources

• Wiktionary: 百炼成钢
• MDBG: 百炼成钢
• Examples with 百炼成钢 on Tatoeba

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