燕子洞

  • 网络swallow cave;swallow hole
燕子洞燕子洞
  1. 特类喀斯特洞穴旅游生命周期探讨&以云南建水燕子洞为例

    A study on the life cycle of special karst cave with a case of Jianshui Swallow Cave in Yunnan Province

  2. 燕子洞生命周期形成机制研究

    Preliminary study of tourist cycle of swallow cave in Jianshui county

  3. 原来,墨西哥的燕子洞有四百米深,足以放下整个帝国大厦!

    The Cave of Swallows in Mexico is a400m vertical shaft , deep enough to engulf the Empire State Building .