contrapositive
柯林斯词典
1. ADJ placed opposite or against 对照的
2. N a conditional statement derived from another by negating and interchanging antecedent and consequent 对换句
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 对换命题
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