公园中央的喷泉在阳光下闪烁着水花。

The ___fountain in the center of the park sparkles with water droplets in the sunlight.

这个公园里有一个天然泉水，水非常清澈。

There is a natural ___fountain in the park with crystal clear water.

这位老教授是他学生知识和智慧的源泉。

The old professor was a ___fountain of knowledge and wisdom for his students.