25. “parent/child, husband/wife, predecessor/successor” are __________.（2分） contrary terms contradictory terms relative terms complementary terms

"parent/child, husband/wife, predecessor/successor" are relative terms.12459 These terms represent relational opposites that indicate a reciprocal relationship between two entities. For example, a parent is someone who has a child, and a child is someone who has a parent. Similarly, a husband is to a wife as a wife is to a husband, and a predecessor is someone who is followed by a successor, while a successor follows a predecessor. These terms do not represent contrary or contradictory meanings, nor do they represent complementary terms, which would imply a relationship of completeness or mutual exclusivity. Instead, they describe roles or positions in a relationship that are inherently connected and interdependent.25