底蕴 (dǐ yùn): thông tin bên trong

This old professor has taught in the history department for forty years; when he talks about Ming and Qing archives, he knows them like the back of his hand—you can tell at a glance that he has deep inside knowledge.

Even though he is young, he learned to restore ancient paintings from his grandfather since childhood, and he has a solid foundation of inside knowledge about paper, pigments, and mounting techniques.

In order to write this article about the southward relocation of Palace Museum artifacts, she combed through the archives' original records and interviewed many people involved, accumulating a lot of first-hand inside knowledge.

The owner of this small teahouse is a retired Chinese teacher; when he chats about local legends and old customs, his inside knowledge is even richer than a tour guide's.

After three years of field research, he gained a great deal of first-hand inside knowledge about ethnic minority clothing, and even senior scholars praised the paper he wrote.