centre circle

例句：

1. 1.The centre of the earth is the point where the sun rises and sets.
   地球的中心是太阳升起和落下的地方。
2. 2.The center of the circle is the point where all other points are located.
   圆心是所有其他点的位置。
3. 3. The center of the table is the point where the legs meet.
   桌子的圆心是腿相交的地方。