Abstract: The original meaning of "peng" is a unit of collective quantity while that of "you" is to help each other . They gradually extend new meaning and then become synonyms because of "peng" referring to the same kind of people in the same group and "you" meaning people with same ambition and interests . Afterward , compared with "peng" and following it , "you" has developed a new meaning indicating two beasts stay together . The evolution of "peng" and "you" in meaning results from the interaction of inward an...