1、
Sun Jiacong had an idea of the mirror image symmetry of the ore distribution the ater.
这一发现无疑对矿床形成和分布具有重要的理论意义.
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2、
A wall mirror in the painting area can stimulate the children's attention to natural symmetry.
在绘画区域的一面墙竟能够引起孩子们对自然对称的注意.
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