正题

subject; thesis

1. 黑格尔辩证法特别指与黑格尔通过陈述正题、展开矛盾的反题，并综合和解决它使之成为有条理的综合体而求得真理有关联的过程
   The process especially associated with Hegel of arriving at the truth by stating a thesis, developing a contradictory antithesis, and combining and resolving them into a coherent synthesis.
2. 他的谈话离开正题扯到别处去了。
   His talk branched off from the subject.