portland cement
柯林斯詞典
1. N a cement that hardens under water and is made by heating a slurry of clay and crushed chalk or limestone to clinker in a kiln 波特蘭水泥
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1. N a cement that hardens under water and is made by heating a slurry of clay and crushed chalk or limestone to clinker in a kiln 波特蘭水泥