A refined substance has been made pure by having other substances removed from it.
refined sugar.
精制糖。
If you say that someone is refined, you mean that they are very polite and have good manners and good taste.
genteel
refined and well-dressed ladies.
举止文雅、衣着考究的女士们。
If you describe a machine or a process as refined, you mean that it has been carefully developed and is therefore very efficient or elegant.
This technique is becoming more refined and more acceptable all the time.
这项技术变得越来越精密和受人欢迎。