| 单词 | cement royal |
| 释义 | > as lemmascement royal hydraulic cements harden under water, and are used for piers, dock-walls, etc. Roman cement, like all the hydraulic cements, is an argillaceous lime. Portland cement is so called because it resembles in colour the Portland stone. It is prepared by calcining a mixture of the clayey mud of the Thames with a proper proportion of chalk (Ure). Also cement royal.extracted from cementn.< as lemmas |
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