柯林斯詞典contrapositive /?k?ntr??p?z?t?v/ 1. ADJ placed opposite or against 對照的2. N a conditional statement derived from another by negating and interchanging antecedent and consequent 對換句3. N a categorial proposition obtained from another, esp validly, by any of a number of operations including negation, transferring the terms, changing their quality, and also possibly weakening from universal to particular 對換命題 返回 contrapositive