唇亡齒寒（唇亡齒寒|脣亡齒寒）　

◎ 唇亡齒寒 chúnwáng-chǐhán

[mutual dependency of neighboring countries when confronted with a powerful and aggressive enemy;share a common lot] 唇?jīng)]有了,牙齒就寒冷。比喻雙方休戚相關(guān),榮辱與共