In the middle, get the meaning of the scale, to be fair and just. There are two readings, the sound Zhong, for cause. The sound multitude, for the effect. Small not in the middle, there is conflict. If you are not neutral in a big way, there is war. The history of China is the history of fairness and justice, and by extension, the unification of the world. In the words of Zhongyong, it is called: cars on the same track, books in the same language, behavior in the same line. In the words of the Analects of Confucius, it is called: "Be careful with the amount of power, examine the law, repair the abolition of the government, and the government of the four directions will be carried out". In the middle, from b, metaphorical clue, refers to the hanging rope, one side of the rope, is a pole scale, two sides of the rope, is a flat scale. From vertical, metaphorical stand, refers to the role of the scale, not fair and impartial, can not be established. Vertical, hieroglyphic scales, anciently known as scales. From ding, referring to an individual, weighted, relatively independent. In the case of a pole scale, it also refers to a gripper. In the case of a flat scale, also refers to the fulcrum. Weight, in the case of a pole scale, commonly known as a steelyard. In the case of a flat scale, a weight. In the middle, the meaning of the scale, is the weight, is the law, is related to people's livelihood. In terms of the country, whether it can win the trust of the people, fair and just, is the element. Chinese people, believe that the world is public, believe that there is a scale between heaven and earth, in or out, in the hearts of the people. If the people do not believe, the country will not be established.