As textbook has undergone tremendous changes in both its forms and functions, it is extremely significant to conduct progressive studies on textbook discourse.
教科书语篇作为教育语篇的一种主要类型，在其形态和功能上都发生了很大的改变。
Intermediate and advanced learners of Chinese make errors in discourse production frequently, which is a great challenge to the structure design system of the present textbook.
高级汉语学习者语篇偏误的产生是经常的、大量的，这使现有教材的结构设计系统面临着挑战。
Intermediate and advanced learners of Chinese make errors in discourse production frequently, which is a great challenge to the structure design system of the present textbook.
高级汉语学习者语篇偏误的产生是经常的、大量的，这使现有教材的结构设计系统面临着挑战。
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