精于 jīngyú to be proficient in Origin Definitions Defs Strokes Stroke Words Sentences Sents 业精于勤 yèjīngyúqín excellence through diligence mastery of a craft or academic study comes from diligent application; practice makes perfect精于此道 jīngyúcǐdào to be an expert in this field to be proficient in this particular area; skilled in this field