Explanation of pacesetter:
1. Refers to a trained soldier who is arranged in front of a line of soldiers during drill as a demonstration of drill action.
2. The soldiers used to mark the boundary on the parade ground generally refer to the people used to mark a certain boundary in the mass rally.
3. One or a group of typical figures who are inclined to or aimed at making people imitate or imitate.
Source: Shen Defu of the Ming Dynasty, "The Beginning of Ye Huo's Compilation of a Governor to Rectify the Military Preparedness": "But Chengping has been like an official guarding the land for a long time. There is no model to train and no military pay to pay." And the 46th chapter of Flower and Moon Traces: "Let's ask each discipline has the title of pivot, and has the hand of a model. How can we say that we do not know the military?"