Truss wasn't oblivious to the change — 0.015s is still an order of magnitude higher than the first simple case investigated in this article.
truss并没有忘记所做的更改，0.015秒比本文中研究的第一个简单示例要高一个数量级。
Structurally, the roof form consists of simple "a" frame trusses inverted to form a flat roof, each truss individually supported by a steel column.
在结构上，屋顶形状由简单的“A”形框桁架结构组成，框桁架倒置形成平屋顶，每个桁架分别由一根钢柱支撑。
As the paper's research object is truss structure, a simple life cycle optimization model for it is established.
由于本文的研究对象为桁架结构，因此建立了其优化设计的简单生命周期模型。
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