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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Fraud was a material part of the mortgage collapse, a big factor in commercial property and loan losses and a component in investment banking and private-equity losses that did more damage than acknowledged.

ECONOMIST: Letters

While many of us see this activity as just the early stages of what will become a long-term, sustainable component of the New York economy, some veteran observers are already forecasting the collapse of another tech bubble.

FORBES: Why 2013 Will Be a Big Year for NYC's Tech Startups!