隔岸觀火 隔著河看人家著火。比喻對別人的危難不去求助，在一旁看熱鬧。
嘴唇?jīng)]有了，牙齒就會感到寒冷。比喻利害密要相關。
[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,榮辱與共
