正确分析风荷载对结构的动力作用是设计既经济又安全结构的重要保障。
Proper analysis of wind-force's dynamic effect on structures ensures economy and safety in designing structures.
合理的施工方案和科学分析是保证结构安全经济的重要手段。
Reasonable construction method and scientific analysis is an important way that ensure a structure safe and economic.
一连串的恐怖袭击事件发生在911（9月11日），从国土安全上看，911是一个时代的关键性时刻，而从经济角度来分析，也同样如此。
The events of 9/11 are the defining moment of the era from the standpoint of national security; they were equally significant from an economic perspective.
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