名词
1. 课本;教材;教科书
A textbook is a book containing facts about a particular subject that is used by people studying that subject.
2. (案件、例子)典型的，典范的
If you say that something is a textbook case or example, you are emphasizing that it provides a clear example of a type of situation or event.
1. a book prepared for use in schools or colleges
e.g. his economics textbook is in its tenth edition
the professor wrote the text that he assigned students to buy