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.
The house is a textbook example of medieval domestic architecture.
这座房子是中世纪民居建筑的典型范例。
textbooks
A textbook is a book containing facts about a particular subject that is used by people studying that subject.
course book
She wrote a textbook on international law.
她写了一本国际法教科书。
a chemistry textbook.
一本化学教科书。