The sea of ??learning has no boundaries

Explanation of the sea of ??learning: knowledge. The ocean of knowledge is boundless.

A lot of people

Explanation: Dongyu, house. The cows sweat when the books are transported, and they can be piled up to the roof when stored. Describes a very large collection of books.

Pictures on the left and history on the right or pictures on the left and books on the right

Explanation to describe the abundance of books in the room.

A vast ocean

Explanations and descriptive documents, information, etc. are very rich.