diligent/ˈdɪlɪdʒənt; `dɪlədʒənt/ adj~ (in sth/in doing sth) showing care and effort (in what one does); hard-working 认真刻苦的; 勤勉的; 勤奋的; 用功的 a diligent worker, pupil, etc 勤奋的工作者、 学生等 They're very diligent in keeping records. 他们做记录十分认真.
牛津英汉双解词典