speleology

他对洞穴学的兴趣使他成为了一名专业的洞穴探险家。

His interest in ___speleology made him a professional cave explorer.

她对洞穴学充满热情，梦想着有一天能发现新的地下洞穴系统。

She is passionate about ___speleology and dreams of discovering new underground cave systems one day.