站在金字塔的顶点，你可以看到整个城市的美景。

Standing at the ___vertices of the pyramid, you can see the beautiful view of the whole city.

正方形的四个顶点位于其边角处。

A square has four ___vertices at its corners.

他的科学研究在获得诺贝尔奖时达到了顶点。

His scientific research reached its ___vertex when he won the Nobel Prize.