“精益求精”，汉语成语，比喻已经很好了，还要求更好。可以翻译为“constantly perfect one's skill，refine on/upon”等。
例句：
身为音乐家，她多年来不断在技艺上精益求精。
As a musician, she has spent years perfecting her technique.
小编推荐： in great delight 兴高采烈 make every attempt 千方百计 after a storm comes a calm 雨过天晴