As it turns out, the tower's strength is largely due to that near-forgotten puddle iron — the engineers estimate that the tower will still be standing for at least another two or three centuries.
工程师预计埃菲尔铁塔至少还会继续屹立2到3个世纪。
While test engineers cannot estimate total project cost, they can certainly estimate testing contribution to cost, and suggest test risks and feasibility.
虽然测试工程师不能估算总的项目成本，但是他们的确可以评估对成本的测试贡献，并且提出测试风险和可行性。
After the road projects were completed, Olken had engineers dig up core samples in each road to estimate the quantity of materials used.
在道路项目完成后，Olken让工程师在各条道路上挖取核心样品，以估算使用的材料的数量。
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