How it used to be written
These are the forms of 鍊, the traditional character: 炼 is a twentieth-century simplification, found in no ancient corpus.
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Small seal script
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).
Examples
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油是从橄榄中提炼出来的。
Oil is extracted from olives.
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游泳锻炼肌肉。
Swimming develops your muscles.
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这以后要经常锻炼,我买了点补药给你吃吃看。
From now on, you should exercise regularly. I bought some health supplements for you to try.