各位大大，这样的推荐信行吗，会不会太简单？To whom it may concern,
This is to recommend $$$, who is one of my talented student. $$$ took my courses in 2012 and I was also his advisor in a student project.
He has the following strengths that I found during these two years:
1. He is responsible and helpful: He is willing to help in organizing the teams in my courses. He always double checks that the jobs such as preparing experiments are well done.
2. He is hardworking as he is really interested in this area.
3. He is open and thirsty to learn.
Overall, I would strongly recommend $$$ to apply your program. I hope he can succeed.