[业精于勤 / 業精於勤, yè jīng yú qín, ㄧㄝˋ ㄐㄧㄥ ㄩˊ ㄑㄧㄣˊ]mastery of study lies in diligence (成语 saw). You can only master a subject by assiduous study.; Excellence in work is only possible with diligence.; Practise makes perfect.#118120[Add to Longdo]
[つとめる, tsutomeru](v1, vt) (1) (usu. 勤める) to work (for); to be employed (at); to serve (in); (2) (usu. 務める) to serve (as); to act (as); to fill (the position of); to play the role (of); (3) (usu. 勤める) to conduct a religious service; (P)#14909[Add to Longdo]