He positioned his feet on the tunnel floor, assessing his footing and evaluating the strength of the concrete beneath him.

他在隧道底板上一步步向前，估计着自己的落脚点和脚下混泥土的强度。

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It is found that the internal stress of the lining obtained by means of field monitoring is smaller than the strength of the concrete lining.

现场监测结果表明，衬砌施工后内部应力普遍较小，未超过混凝土强度。

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The strength of the real-estate market directly affects the construction, steel, concrete, power and appliance industries.

房地产市场景气与否直接影响到建筑、钢铁、水泥、电力和家电行业。

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Another study, published back in 1995, showed that although the compressive strength of concrete was enhanced only slightly by the addition of polymer fibres, its impact resistance improved sevenfold.

ECONOMIST: Bunker-busting

And even though steel and concrete are still the most cost-effective materials, new combinations of these substances provide greater strength and fire retardance, says W. Gene Corley, senior vice president at Construction Technology Laboratories in Skokie, Ill.

FORBES: They Will Rise Again