ascendant vertex

例句：

1. 1. The ascent of the mountain was challenging, but it was worth the view at the summit.
   爬山的攀登过程很有挑战性，但山顶的风景值得一看。
2. 2. The astrophysicist used a telescope to observe the ascending vertex of the star.
   天文学家使用望远镜观察那颗恒星的上升顶点。
3. 3. The team reached the ascending vertex and started their descent.
   队伍到达了上升顶点，开始下降。