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Insect wings are specialized biological composite structures enabling insects to perform a versatile flight.The flight ability of insects is highly dependent on the deformation that wings experience during strokes.How do insects control the deformation of their wings? Most insects use both active and passive mechanisms for this purpose.However,considering that there are no muscles within the wings,the passive wing deformations are of high importance.We investigate the effect of vein-joints,serving as one of the passive mechanisms,on the deformability of dragonfly(Odonata)wings.