If you extract resources at a rate beyond the level of replenishment, your stock will collapse.
如果开采资源的速度超过了补充的水平，你的储备就会散个干净。
A naive belief that house prices could never fall at the national level encouraged excessive speculation and lax lending, thereby precipitating an eventual collapse.
人们认为全国范围的房价总水平绝不会下跌，这一天真的想法鼓励了过度投机和宽松的借贷，从而导致了最终的房市坍塌。
A useful feature to add to your applications is the capability to expand or collapse all top-level tree items.
可以向应用程序中添加一个有用的特性，那就是展开或折叠所有顶级树项目的功能。
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