报道说，工程师们花了18个月的时间重新设计外部燃料箱，同时参考了“哥伦比亚”号事故调查组提出的修改建议。

Engineers have spent 18 months redesigning the external tank and incorporating the changes recommended by the Columbia Accident Investigation Board.

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例如，设计路面的工程师并不一定要把他们的尝试完全建立在实验的基础上，而是能用其他人的结论作为参考。

For example, engineers designing a pavement do not have to base their attempts entirely upon experimentation, but can use reference sources that describe the conclusions of others.

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本文可供结构工程师在设计中参考。

This paper may be for structural engineers 'reference in their designing.

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