姻亲: relation by marriage 短语和例子姻亲故旧 marriage connections and old friends; 姻亲关系 relationship by marriage; affinity; 夫[妻]系的叔伯辈姻亲 his [her] uncle by marriage
直系: direct line◇直系继承人 heir of line; heir of one's body; 直系亲属 lineal relative [relation; dependent]; directly-related members of one's family; 直系祖先 progenitor
