It was only thirty years ago that the building industry felt confident enough to erect office blocks of steel and reinforced concrete that had more than a dozen floors.

建筑行业是从30年前才开始有信心建造超过12层楼高的钢筋混凝土结构的办公大楼。

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To reduce the overall weight of the building, it used less concrete in the floors; that in turn enabled it to cut down on structural steel.

为了减少建筑的整体重量，它在楼层中使用了较少的混凝土；这反过来又减少了对结构钢的使用。

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Building all these new turbines, solar panels, and other infrastructure would eat up plenty of steel, concrete, and other resources.

建造所有这些新的涡轮机，太阳能板和其他的基础建设将用掉大量的钢铁，混凝土和其他资源。

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It is sometimes used in combination with modern materials like reinforced concrete or steel for building houses and bridges.

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As a pre-fabricated structure it also took less time to construct and was cheaper than a conventional steel and concrete building, says Liddell.

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As environmental concerns become ever more prevalent, some architects are moving away from the glass, steel and concrete model of modern city building.

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