observatory

山顶上有一座小型天文台。

There is a small ___observatory on the mountaintop.

学生们参观了山顶的天文台，那里有许多专业望远镜。

The students visited the mountain-top ___observatory, which has many professional telescopes.

山顶的天文台提供了俯瞰整个城市的绝佳视野。

The mountain-top ___observatory offers a perfect view of the entire city.