https://blog.gongquiz.com/2024/01/03/%ec%9e%a1%ec%a2%85%ea%b0%95%ec%84%b8-%ed%98%84%ec%83%81%ec%9d%98-%eb%b0%9c%ed%98%84expression%ec%97%90-%eb%8c%80%ed%95%9c-%ec%84%a4%eb%aa%85%ec%9c%bc%eb%a1%9c-%ed%8b%80%eb%a6%b0-%ea%b2%83%ec%9d%80/