Gypsum is a kind of material that has been used in the ancientry.It is considered as the mainstay of binding material with lime and cement.是什么意思_Gypsum is a kind of material that has been used in the ancientry.It is considered as the mainstay of binding material with lime and cement.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句