Apex patellae

例句：

1. 1.The apex of the mountain is the highest point.
   山的顶点是最高的点。
2. 2.The apex of the curve is where the two sides meet.
   曲线的顶点是两边交汇的地方。
3. 3. The apex of the ridge is the highest point on the mountain.
   山脊的顶点是山上最高的点。