It reveals the inner law of the content of teaching. It conveys abstract content of teaching by means of image.

它揭示教学内容的内在规律，将抽象的教学内容用形象具体的各种形式表现出来。

youdao

In computer networks theory, ISO/OSI seven layers architecture is an important abstract content. It is a key to understanding network theory.

在计算机网络理论中，ISO/OSI七层体系结构是一项重要但很抽象的内容，理解ISO/OSI七层体系结构是驾驭网络理论的一个关键。

youdao

Advanced mathematics has made a qualitative leap both in ways and in subjects compared with primary mathematics. Its abstract content and logic always put students in puzzle in learning.

高等数学这门课程无论是方法上还是对象上对比初等数学都是一个质的飞跃，其内容的抽象性和逻辑性造成了相当一部分学生学习的困惑。

youdao

Like many of the artists in his circle, Brooks abandoned his earlier, representational style for abstract content and broad brushstrokes that would come to define the postwar era.

WSJ: Works of Flavin and Brooks at Greenberg Van Doren

The content problem is not an abstract one either, it is actively causing users to leave the site.

FORBES: Can Facebook's New News Feed Help it Solve Its Content Problem?