内切圆心

例句：

1. 1. The center of the circle is the point where all other points are equidistant from it.
   圆的中心是所有其他点与它距离相等的点。
2. 2. The center of the Earth is located at the geographic North Pole.
   地球的中心位于地理北极。
3. 3. The center of gravity is the point of maximum force exerted by a body.
   重心是物体所受最大力的作用点。