本文从语法学、伦理学和历史学的角度,对《诗经·氓》中的悬案“(口至)其笑矣”作了全面而深入地探讨.在蠡定“(口至)其笑矣”的语法关系的基础上,确定了兄弟们对女主人公的态度;并进而对兄弟们为什么要对其采取这样的态度进行了翔实的多方面的分析,从而得出可信的结论. This article, from the perspective of grammar, ethics and history, makes a comprehensive and in-depth discussion of the pending case of “The Book of Songs and the Fairy Tales” (mouth to mouth laughter). "Based on the relationship between the brothers to determine the attitude of the heroine; and then why the brothers to take such an attitude on its full and detailed analysis, and come to credible conclusions.