Now, because he's talking about his job working as a doctor, there's a lot of medical terminology that I don't know.
现在， 因为他在谈论他的医生工作，所以有很多我不知道的医学术语。
英语词汇演变史
The reason being that there are lots of technical words and medical and scientific terminology that are never used in general conversation, but there are lots of them.
原因是有很多专业词汇以及医学和科学术语从未在一般对话中使用过，但是有很多。
英语百科
Medical terminology
Medical terminology is language that is used to accurately describe the human body and associated components, conditions, processes and procedures in a science-based manner. . It is to be used in the medical and nursing fields.
Suffixes are attached to the end of a word root to add meaning such as condition, disease process, or procedure.