在2009年，美国土木工程协会发布了一份关于美国基础建设状况的调查报告。

In 2009 the American Society of Civil Engineers released a survey of the state of infrastructure in the u.

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土木工程师建造桥梁和其他结构的数学模型，从而在进入昂贵的实际建设阶段之前计算出所设计的结构能够承受多大的重量和压力。

Civil engineers build mathematical models of Bridges and other structures to calculate how much weight and stress they can bear before committing to an expensive construction phase.

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在2009年，美国土木工程协会发布了一份关于美国基础建设状况的调查报告。

In 2009 the American Society of Civil Engineers released a survey of the state of infrastructure in the U.S..

youdao