In its narrow sense, for one thing, the foreword is under a chain structure and for another thing, the body supported by specific opinions are organized and structured by subheads which are embodied by coherent semantic topics.

• 从微观语篇来看,一是前言部分形成链式话题结构,二是前言引进的若干具体意见形成的主体部分由小标题话题结构组架起来,每一小标题话题结构需由语意连贯的话题结构直接兑现。