Apex cuspidis

例句：

1. 1.The mountain reaches its apex at the highest point of the valley.
   这座山在山谷的最高点达到顶峰。
2. 2.The company's performance has reached its apex in recent quarters.
   该公司最近几个季度的表现达到了顶峰。
3. 3. The sun sets at the apex of the sky.
   太阳在天空的最高点落下。