Karst cave, an important component of karst geomorphology, is formed by geological agent corrosion, erosion and collapse.

喀斯特洞穴是喀斯特地貌的重要组成部分，在地质营力溶蚀，侵蚀和崩塌作用下形成。

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Fatigue failure of metal structural component is a common form of structure collapse, so improving fatigue behavior of metal materials is very important for their usage.

金属构件的疲劳失效是一种常见的结构破坏形式，改善金属材料的疲劳性能对其使用性能的提高有重要意义。

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Fatigue failure of metal structural component is a common form of structure collapse, so improving fatigue behavior of metal materials is very important for their usage.

金属构件的疲劳失效是一种常见的结构破坏形式，改善金属材料的疲劳性能对其使用性能的提高有重要意义。

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