例句:
He majored in international commerce in college.
2. 专业人员的助手受过训练辅助专门人员的`非专职人员
A trained worker who is not a member of a given profession but assists a professional.
3. 医术，医业，医学有关医学的技术和专业
The art or profession of medicine.
4. 从业者，执业者从事某事的人，尤指从事职业、专业或技术的人
One who practices something, especially an occupation, a profession, or a technique.
