Portland cement

type of cement made from chalk and clay similar in colour to Portland stone 普通水泥; 波特兰水泥.

port, port of call, portability, portable, portage, portal, portal vein, portcullis, portend, portent, portentous, portentously, porter, porter's lodge, porterage, porterhouse steak, portfolio, porthole, portico, portion, Portland stone, portliness, portly, portmanteau, portmanteau word, portrait, portrait painter, portraitist, portraiture, portray, portrayal, Portsmouth, Portugal, Portuguese, pose, poser, poseur, posh, posit, position,