◎ 唇亡齿寒 chúnwáng-chǐhán[mutual dependency of neighboring countries when confronted with a powerful and aggressive enemy;share a common lot] 唇没有了,牙齿就寒冷。比喻双方休戚相关,荣辱与共-----------------国语辞典:嘴唇没了,牙齿就会感到寒冷。比喻关系密切,休戚相关。《左传.僖公五年》:「辅车相依,唇亡齿寒。」《三国演义.第一九回》:「明上今不相救,恐唇亡齿寒,亦非明上之福也。」近休戚相关,巢毁卵破,巢倾卵破,唇齿相依