罗马的混凝土是把沙子、石灰粉和碎石掺合到一块来，和今天的做法很相似。

Romanconcrete was a mixture of sand, powdered 3 limestone and stone 4 rubble, pretty well what it is today.

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对于罗马人来说，混凝土最重要的事实之一就是它可以在水下建造。

One of the most important facts about concrete for the Romans was that it can be created underwater.

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混凝土的这种奇特特性为罗马帝国的成功作出了重大贡献。

This strange characteristic of concrete made a significant contribution to the success of the Roman Empire.

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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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一世纪罗马人建造的古代混凝土体育馆使用非常类似的材料，和熟练的工匠石头建成的罗马帝国著名的道路网络。

The first century Romans built much of the ancient Coliseum using concrete-like materials, and skilled stone artisans constructed the Roman Empire's famous network of roads.

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混凝土也许一直是罗马帝国的秘密武器之一。

Concrete may well have been one of the secret weapons of the Roman Empire.

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现在这座拥有50000个座位的石头与混凝土修建露天竞技场为罗马发挥着另外一个功能：交通环形岛。

Now, the 50,000-seat stone-and-concrete amphitheater serves Rome in another capacity: as a traffic circle.

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现在这座拥有50000个座位的石头与混凝土修建露天竞技场为罗马发挥着另外一个功能：交通环形岛。

Now, the 50,000-seat stone-and-concrete amphitheater serves Rome in another capacity: as a traffic circle.

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