https://purengom.com/2011/07/20/mac-os-x-lion%ec%97%90%ec%84%9c-%ed%84%b0%ec%b9%98%ed%8c%a8%eb%93%9c-%ec%8a%a4%ed%81%ac%eb%a1%a4%ec%9d%b4-%eb%b0%98%eb%8c%80%eb%a1%9c-%eb%90%98%eb%8a%94-%ea%b2%83%ec%9d%b4-%eb%b6%88%ed%8e%b8%ed%95%a0/