https://blog.gongquiz.com/2022/11/10/%ec%a7%80%ed%95%98-%ea%b9%8a%ec%9d%80-%ea%b3%b3%ec%97%90%ec%84%9c-%ea%b4%91%ed%99%94%ec%9a%a9%ec%95%a1ore-bearing-fluid%ec%9d%b4-%ec%9d%b4%eb%8f%99%ed%95%98%eb%8a%94-%eb%b0%a9%eb%b2%95%ec%9c%bc-2/