公园里那些装饰着彩色玻璃的小洞穴特别受欢迎。

The small ___grottoes decorated with colored glass are very popular in the park.

游客们惊叹于这些天然形成的洞穴，据说曾有僧人在此修行。

Tourists marvel at the natural ___grottoes where monks once meditated.