求翻译：There are at least three items that must be present in the structure of a building:stability,strength and stiffness,economy是什么意思？

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悬赏分：1 - 离问题结束还有

There are at least three items that must be present in the structure of a building:stability,strength and stiffness,economy

问题补充：

匿名	2013-05-23 12:26:38 有的建筑：稳定性、强度和刚度、经济结构中必须存在的至少三个项目

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