calcium sulphate
noun [ U ] chemistry UK specialized (US calcium sulfate) uk/ˌkæl.si.əm ˈsʌl.feɪt/ us/ˌkæl.si.əm ˈsʌl.feɪt/
硫酸钙（白色化合物，用于制水泥，熟石膏或食物添加剂）
a white chemical substance used to make cement and plaster of Paris and to make other substances dry
石膏
→ gypsum