Ancient Doctor's Material: In ancient times, being a doctor was a very important profession. Their duties included the diagnosis and treatment of diseases, the treatment of diseases, the provision of nutrition, and the care of patients. In ancient China, doctors were usually nobles and literati. They had a wealth of knowledge and skills to provide better treatment for patients. In ancient Greece and Rome, doctors were also a very important profession. Their duties included the diagnosis and treatment of diseases, the treatment of diseases, the provision of nutrition, and the care of patients. In ancient Greece, doctors were usually philosophers and mathematicians who had a wealth of knowledge and skills to provide better treatment for patients. Material for Modern Doctors: In modern times, doctors had become a very important profession. Their duties included the diagnosis and treatment of diseases, the treatment of diseases, the provision of nutrition, and the care of patients. In modern times, Chinese doctors were better developed and educated, and they began to use western medical theories to diagnose and treat diseases. In modern times, European doctors were better developed and educated, and they began to use Western medical theories to diagnose and treat diseases. In modern times, doctors became a very important profession in the United States. They got better development and education and began to conduct large-scale research on diseases.