https://purengom.com/2019/08/28/%eb%a7%a5%ec%9d%98-%ec%a0%80%ec%9e%a5%ea%b3%b5%ea%b4%80%ec%9d%84-%ed%99%95%eb%b3%b4%ed%95%98%eb%8a%94-%eb%b0%a9%eb%b2%95-macos-%ea%b8%b0%eb%b3%b8-%ea%b8%b0%eb%8a%a5-%ed%99%9c%ec%9a%a9/