辅车相依

Explanation: Auxiliary: cheek bone; car: gum. Cheek bone and teeth bed rely on each other. Analogy is closely related to stakeholders 　　Usage: The main predicate; as the predicate attribute; analogy between the two are closely related and interdependent 　　Source: Hengyu "Zuo Xi public five years": "saying the so-called 'auxiliary car dependent, interdependent', its Yu Guo that also." 　　Examples: Words to political parties, still not the time; Ruoyun ~, to schedule a one-party authoritarian trend, then there is fluctuation thin ears. (Zhang Binglin "To Liang book") Thesaurus:  be bound together like brothers and sisters, as well blended as milk and water, be finger and glove with sb., brotherliness, Trinity, As close as body, One turn, brotherly feeling