There is another form of vitamin A that coats the inside of the cells with a protective lining that sustains the skin of the cell as it heats up in the act of cell metabolism (digestion of sugar).

• 第二种维生素A用一层支持细胞表皮的保护层把细胞从里面包起来，因为在细胞代谢（消化糖类）中细胞表皮会变热。