troglodyte [ˈtrɑ:glədaɪt]

例句:

• This is the most outstanding, intact example of a troglodyte settlement in the Mediterranean region ecosystem.
  马泰拉位于意大利巴西利卡塔地区的南部,是地中海地区保存最为完好、典型的史前穴居人定居点.
  
• Unless you're an spelunker, or a troglodyte , the answer is probably not too often.
  除非你是一名洞穴探索爱好者或者一名穴居人.