《谋政》:“不知彼而知己,一胜一负”。课本和不少书上都注成:“意思是胜负各半”。此处的“一”不是数词。在“不知彼而知己”这个条件下,胜和负之间没有必然的联系,更不存在因果关系。它们之间只存有或然性、偶然性而已。查《辞海》“一”词条第十三义项的解释是:或。所用的例句恰巧就正是这一句。在先秦著作里,“一”常作“或”解: “Political Consultative”: “I do not know each other and friends, a win and a loss.” Textbooks and many books are written: “The meaning is the outcome of half.” “One” here is not a numeral. Under the condition of “I do not know one another and one’s friend”, there is no necessary connection between victory and defeat, and there is no causal relationship between them. There is only contingency between them. Check the “Ci Hai” “a” term thirteen items of explanation is: or. The exact phrase used is exactly this one. In the pre-Qin writings, “a” often make “or” solution: