The kind big brother and big sister helped to read the meaning of this passage.

Chen Mei said nothing but to do math. It means that he has put all his thoughts into mathematics. Huang Yongyu said that he could do nothing but draw, which is the same reason. A successful person, no matter how smart and talented he is, must have another advantage called concentration. If you are a student, I hope you can learn something from this passage and study hard.