The word Tian is a mouth plus a cross. The mouth is wide open. The so-called mouth is big and eats in all directions. The cross stretches left and right. It means having both sides. It is upright and upright. It occupies a very important position in what we call agricultural production. , obviously, the word Tian has been closely related to the lives of farmers since ancient times, and is also related to the economic rise and fall of the country. The spoken word is divided into several parts by crosses to provide people with more resources.