You can get a theoretical knowledge of angling from textbooks.你可以从教科书上得到关于垂钓的理论知识。We were plunged into all the theory right at the start of the course.这门课一开始,我们就要学习那么多理论知识。She has theoretical knowledge of teaching, but no practical experience.她有教学方面的理论知识,但没有实际经验。