The Roman Empire mastered cement making, and some of that culture's masonry Bridges still stand 2,000 years later, author Courland said.

作者Courland说，罗马帝国掌握了水泥的制造，并且在当时建筑文化下的砌体结构保持了2000多年。

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The Roman Empire mastered cement making, and some of that culture's masonry Bridges still stand 2,000 years later, author Courland said.

作者Courland说，罗马帝国掌握了水泥的制造，并且在当时建筑文化下的砌体结构保持了2000多年。

youdao