汉语发展史上，“於”和“于”的发展经历了几个阶段：甲骨文只有“于”，既可作介词，又可作动词；金文中的“于”作介词，但仍可作动词；春秋战国时期“于”主要作介词，并出现了“於”、“乎”、“诸”等变体；两汉时期，“于”逐渐让位于“於”；其后，“于”、“於”便逐 In the history of Chinese development, the development of “Yu” and “Yu” has undergone several stages: the only thing that Oracle can say “Yu” can be both prepositions and verbs; while “Jin” can be used as a preposition but can still be used as a verb; In the period of the Spring and Autumn Period and Warring States Period, “Yu” mainly used the prepositions and appeared the variations of “Yu”, “Hu” and “Zhu”; in the Han Dynasty, “Yu” gradually gave way to “Yu”; later, In "will be by