勤勤恳恳 - work
diligently and conscientiously
兢兢业业 - be cautious and
conscientious
工作时间 长 - working for long hours
默默无闻 - be unknown and unsung
勤勤恳恳 - work
diligently and conscientiously
兢兢业业 - be cautious and
conscientious
工作时间 长 - working for long hours
默默无闻 - be unknown and unsung