If the strength is important, and the cement at the site is old, it should be tested . 在强度极为重要的情况下，水泥在工地上存放过久时，水泥必须经过试验。
Phosphogypsum can be used in products for which color is not so important, as in wallboard and cement . 磷石膏可以用在不怎么讲究色泽的产品中，象墙板和水泥。
When we get a shot the way it is, we'll chip out the rest of the cement and expose the illegal pipe . 我们先按这个样子照下来，再把其余的水泥凿开，把非法管道暴露出来。
The cement paste covers the surface of the stones and sand particles, binding them together when it hardens . 水泥浆充填盖满石子和砂粒的表面，硬化时将它们胶结在一起。
This cement first patented in 1824 but it was not in wide use until the beginning of the present century . 这种水泥在1824年首次获得专利，但是直到本世纪初才得到广泛地应用。
Each white man who attended the fight dropped his share of the pot into a hat that sat on the concrete floor . 出席观看拳击的每个白人都把自己那份钱放在水泥地板上的礼帽里。
This cement was first patented in 1824 but it was not in wide use until the beginning of the present century . 这种水泥在1824年首次取得了专利，但是直到本世纪初才广泛地应用。
In countries air-entraining cement can be bought from the cement maker, no air-entraining agent needs to be mixed in . 在一些国家中，可以从水泥制造厂处买到加气水泥，而无须中间人介入。
The going wasn't easy, she slipped on a piece of ragged concrete and tore her dress on a rusty bit of steel rod . 走进去不是那么容易的，她踩了一块碎的水泥滑了一下，给一根锈钢条刮破了衣服。
Of the various portland cements, the following varieties are now generally available from the makers in industrialized countries . 在各种波特兰水泥中，工业化国家的生产厂目前一般供应下列品种。
