There are many idioms or words that indicate professionalism. [1. Profound and profound: It is used to describe a person who has rich knowledge and is profound and profound.] 2. Profound and extensive: To describe a person who has profound knowledge and rich content. Domain Expert: A person with rich knowledge and experience in a certain field. Professional knowledge: refers to the specific knowledge learned in a certain field. 5. Terminology: It refers to the use of specific terms and expressions in a certain field. 6. Professional Skills: refers to the specific skills and abilities in a certain field. 7. Secrets of an industry: It refers to confidential information within an industry that is not easily leaked. Professional level: refers to the technical level and ability level in a certain field. Professional spirit: refers to the spirit of rigor, seriousness, and excellence in a certain field. Professional education: refers to specialized education in a certain field.