Apple is a very common fruit, mainly produced in Shaanxi, Xinjiang, Loess Plateau and other regions. It is not only sweet in taste, but also nutritious and easily absorbed by the human body. It has many varieties, some have yellow skin, while others are pink or red. Apple is a slightly flat bulb with a diameter of more than 5cm, and its upper and lower ends are sunken, usually 7-9cm.