the quality of having parts that match each other, especially in a way that is attractive, or similarity of shape or contents对称(性);匀称
specialized mathematics in mathematics, the quality of having two parts that match exactly, either when one half is like an image of the other half in a mirror, or when one part can take the place of another if it is turned 90° or 180°(数学中的)对称(性)
noun
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