We know that the Romans and other ancient peoples had their hydraulic cements, and the plaster on some of their walls stands to-day to attest its good quality. 威廉·亨利·杜利特.世纪发明.
One of the improvements in the manufacture and use of modern _cements_ and artificial stones consists in their application to the making of streets and sidewalks. 威廉·亨利·杜利特.世纪发明.
Miscellaneous H istory of various Artificial Materials ,--Ena mel, Porcelain, various cements, etc. 李贝.西洋科学史.