a white mineral consisting of magnesium sulphate and potassium chloride; a source of potassium salts; used as a fertilizer.是什么意思_a white mineral consisting of magnesium sulphate and potassium chloride; a source of potassium salts; used as a fertilizer.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句