自由自在的GUCCI
专业 :[zhuān yè]specialized field例句与用法:1. 他大学时的专业是国际贸易。 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.
a淡淡小雨
1.Proprietor Rights & rights and interestsproprietorn.所有者, 经营者2.Practitioner Quantity/Numberspractitionern.从业者, 开业者
jessica0930
practitioner就是从业者的意思，例如medical practitioner，医疗从业者。但一般外国人习惯用profession来询问你的职业，比如what is your profession?
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