File:توضيح علم.png
![File:توضيح علم.png](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/%D8%AA%D9%88%D8%B6%D9%8A%D8%AD_%D8%B9%D9%84%D9%85.png/685px-%D8%AA%D9%88%D8%B6%D9%8A%D8%AD_%D8%B9%D9%84%D9%85.png?20200921003713)
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