Portland cement
noun /ˌpɔːtlənd sɪˈment/
/ˌpɔːrtlənd sɪˈment/
[uncountable]- the most common type of cement used today, made from chalk and clay. It was invented in England in the early 19th century. When it is hard its colour is like that of Portland stone, a type of stone from the Isle of Portland in Dorset used to make grand buildings such as St Paul's Cathedral.
波特兰水泥：当今最常用的水泥，由白垩和粘土制成。它是19世纪初期在英格兰发明的。当很难时，它的颜色就像波特兰的石头一样，波特兰岛的一种石头来自多塞特郡的波特兰岛，曾经用来建造圣保罗大教堂等宏伟的建筑。