Crista medialis

例句：

1. 1. The center of the circle is the point where all sides meet.
   圆的中心是所有边相交的点。
2. 2.The median stripe on the field is used to divide the playing area into two halves.
   场地上的中线是用来将比赛区域分成两半的。
3. 3. The median line in the road is a guide that helps drivers stay on the right side of the road.
   道路中的中线是一个指南，帮助司机保持在道路右侧。