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.
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.
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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