pains·tak·ing /ˈpenˌstekɪŋ/
  辛苦,苦心,工夫(a.)辛苦的,勤勉的,小心的
  Pains·tak·ing, n. The act of taking pains; carefulness and fidelity in performance.
  ◄ ►
  Pains·tak·ing a. Careful in doing; diligent; faithful; attentive. “Painstaking men.”
  painstaking
       adj : characterized by extreme care and great effort;
             "conscientious application to the work at hand";
             "painstaking research"; "scrupulous attention to
             details" [syn: conscientious, scrupulous]