File:守恒文字.jpg
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![File:守恒文字.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/%E5%AE%88%E6%81%92%E6%96%87%E5%AD%97.jpg/535px-%E5%AE%88%E6%81%92%E6%96%87%E5%AD%97.jpg?20111202043937)
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