No, don't use exactly the same job description on your letter. Those are keywords that should appear on the text citing you responsabilities. If you copy and past what is there you risk getting rejected. Name your tasks, results, projects and duties.
OK , now I'm confused. I wrote the following duties in my second RA letter. They said we considered it but it is not sufficient. What else should I write in my RA letter? Any suggestion or keyword? I will take this letter to my graduate administer and she'll sign it.
working with his PhD supervisor and research groups in the university to conduct and develop research, literature reviews and studies, develop and improve scientific methods, perform lab experiments, prepare results, and write reports and scientific publications.