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  In the process of biological evolution,it is indispensable for duplication and divergence to the module formation.For a network consisted with several isolated sub-networks,duplication can only cause to local expand,while it can not produce the connection with biological functions,such as module structure.Divergence provides linkages with other potential isolated parts,but it can not contribute with the scale of network growth.Only taking into account these two factors,we can describe effectively the biological evolution mechanism of the network module.……