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contradictory

英/kˌɒntɹədˈɪktəɹˌi/
美/ˌkɑntɹəˈdɪktɝi/
01adj.

反驳的, 反对的, 抗辩的

02n.

矛盾因素, 对立物

two propositions are contradictories if both cannot be true (or both cannot be false) at the same time