谓相互共同防御。 -----------------国语辞典:相互帮助,共同守卫、瞭望。《汉书.卷二四.食货志上》:「出入相友,守望相助,疾病相救,民是以和睦。」近同舟共济反不相为谋,以邻为壑英语 to keep watch and defend one another (idiom, from Mencius); to join forces to defend against external aggressors, mutual help and protection德语 Wache halten und einander helfen (V)