two fold symmetry

Fold (geology) - Wikipedia, the free encyclopedia也做得太小了吧~~ 1 Describing folds 1.1 Fold terminology in two dimensions 1.2 Fold terminology in three dimensions 1.3 Fold shape 1.4 Fold tightness 1.5 Fold symmetry 1.6 Deformation style classes 2 Fold types 3 Causes of folding 3.1 Layer-parallel shortening 3.2 Fault-r...

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Symmetry (physics) - Wikipedia, the free encyclopedia應該是作者取材過吧..??? In physics, a symmetry of a physical system is a physical or mathematical feature of the system (observed or intrinsic) that is preserved or remains unchanged under some transformation. A family of particular transformations may be continuous (such as rot...

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