How does Li express himself in Braille?

Braille consists of six dots. Through these different combinations, many letters or symbols are formed. You need two tools to write Braille. The first is braille paper, which looks like kraft paper. Then there is the Braille board. There are many kinds of braille boards.

Let me introduce the four-line board. As the name implies, the four-line board is called four-line board because it has four lines. It consists of a cover plate, a bottom plate and a plate shaft. There are four rows on the cover plate, each row has 28 squares, each side has four edges, and the cover plate has two eyes on the left and right. Let me introduce the bottom plate. There are two nails on the left and right sides of the bottom plate, just facing the four eyes on the cover plate. The bottom plate is also divided into four rows, each row is 28 squares, but each side has six prototype pits, which is why the cover plate has four sides.