墙上显然缺乏水泥，但正象某些罗马的墙壁，对建筑物本身的坚固朴实却丝毫无损。

Cement was lacking, of course, but, as in the case of certain Roman walls, without interfering with its rigid architecture.

youdao

本文通过研究罗马尼亚s_2油井水泥在高温下形成水泥石的强度衰退规律，提出合理的加砂量并讨论了应加砂的温度范围。

This paper proposed the reasonable amount and the temperature of adding silica flour after studying the strength retrogression of Romania S_2 oil cement at high temperature.

youdao

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。

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

youdao