apex

例句：

1. 1. The mountain's apex is visible from here.
   这座山的顶点从这里可见。
2. 2. The eclipse of the sun at the apex of the moon's shadow is fascinating.
   太阳在月亮阴影的顶点处发生日食时非常迷人。
3. 3. The team achieved its apex performance during the final quarter.
   该队在最后一刻达到了其最佳表现。