总结硬度和规模，强化钢量(钢筋)混凝土是否是绿色或治愈影响叶片的选择。

Aggregate hardness and size, amount of steel reinforcing (rebar) and whether the concrete is green or cured affects blade selection.

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实际上，他说，罗马结构依赖于高强度的拱，寿命远长于现代的依靠钢强化的混凝土建筑，而钢结构最终被腐蚀。

In fact, he said, Roman structures that rely on the arch for strength can far outlast modern concrete buildings that rely on steel reinforcement bars, which eventually corrode.

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试验结果表明，钢表面强化层具有良好的耐磨、耐蚀性能。

The experimental results show that the surface strengthened layers of steel possess better wear and corrosion resistance.

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