Grind the inner wall of gourd to improve the hardness of gourd. Putting emery in the gourd can make the inner wall of the gourd smoother after a long period of grinding, and at the same time, it can decompose the impurities inside the gourd and improve the hardness of the gourd. Cucurbitaceae and Cucurbitaceae belong to Cucurbitaceae. It is a climbing plant, an annual climbing herb with soft hair, white flowers in summer and autumn and monoecious.