hard-working and conscientious

• 勤恳地劳动

  labour with diligence

• 工作勤恳

  be diligent and conscientious in one's work

• 勤恳的工作人员

  hard-working and conscientious worker

• 勤勤恳恳

  earnest and assiduous

• 勤勤恳恳为人民服务

  be diligent and conscientious in serving the public