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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实验观察，在低硫含量的Q 345实验钢中有纳米硫化物夹杂析出，降低硫含量对钢的强化具有有益作用。

There are inclusions existing within nm in the experimental Q345 steel, the reduce in sulfur content is better for strengthening of the steel.

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