相反相成

Explanation: Two things seem to be the opposite, in fact, depend on each other and promote each other. Instead of things that have identity. 　　Usage: Joint type; as predicate; refers to the identity of what a contrast 　　Source: "Han Yi Wen," Benevolence and righteousness, Jingzhi with and, on the contrary and are complementary to each other also. " 　　Examples: Poetry "was originally a gentle and kind," Song Youyi innocent "as Poetry"; This is not to ~. ★ qing "Poetry Ambition Preface" Thesaurus:  to complement each other., each shining more brilliantly in the other's company, bead (of two good things) combined together Case Antonym Group:  empty words, play a sly trick by stealing the sky and putting up a sham sun, chimera, blah, fiddler, swindle and bluff, mystification, worthless ideas, etc, Try to conceal a mistake,only to make it more conspicious, deceive one's superiors and subordinates conceal from higher authority and deceive lower authority, boloney, flapdoodle, blab, deceive those over and bully those below, mystification, bubble, present a false picture of peace and prosperity, confound notion, Online games it play a sly trick by stealing the sky and putting up a sham sun, Baloney, baloney, abracadabra, nonsense, cod, flimflam idea, crock, Enigmatic, talk a lot without seeming to say anything important