Concrete is made of cement, sand, stone and water. 混凝土是由水泥，砂子石头和水混合做的。
The sack of cement hit the ground with a thump. 水泥袋砰的一声落在地上。
Here is a Research of the pozzolanic activity by using the shaft-kiln calcined coal gangue and its result indicates that coal gangue can be used in great amount as addition of cement. 研究了利用石灰竖窑煅烧煤矸石的火山灰活性。结果表明,煅烧煤矸石可作为水泥的混合材而大量利用。
Keywords magnesium oxychloride cement;heat of hardening;additives of cement; 氯氧镁水泥;凝固热;水泥添加剂;
What about the removal of cement sub-gingivally? 如何清除龈下的粘固剂?