推荐回答（4个）
黄昏四宝
陶醉四彤
杜门四将
逍遥四仙
可爱四嬲
旧时中国社会交际习俗，没有血缘关系的人结为兄弟姐妹，因为志趣相投以示亲近的一方式；
也有基于共同利益的个人或集团，以磕头换帖、同饮血酒、对天盟誓的方式结为兄弟姐妹，以共同的信仰和誓言来约束和维护共同的利益关系。
非亲属关系的人因感情深厚或有共同目的而相约为平辈兄弟姐妹，称为"义兄"、"义弟"、"义姐"、"义妹”；
今北方地区则大多称为"干哥哥"、"干弟弟"、"干姐姐"、"干妹妹";
晚辈为"义子"、"义女"，如今北方地区则大多称为"干儿子"、"干女儿";
长辈为"义父"、"义母"，如今北方地区则大多称为"干爹"、"干娘"，属干亲。
结拜(以下称结义)，雅称义结金兰，俗称结义、换帖、拜把子等，这是中国民间同年人结为兄弟般关系的一种形式。它源于三国时代的"桃园三结义"，刘备、关羽、张飞三人结为生死与共兄弟的故事。
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