a way of arguing in which two statements are used to prove that a third statement is true, for example: ‘All humans must die; I am a human; therefore I must die.’ 三段论（由两个前提得出结论的推理方法，如 “凡人必有一死；我是人；所以我必有一死。”） Word Originlate Middle English: via Old French or Latin from Greek sullogismos, from sullogizesthai, from sun- ‘with’ + logizesthai ‘to reason’ (from logos ‘reasoning’).