专业 + 人士 / 专业 + 的
专业 (zhuānyè) means "profession," "specialty," or "professional," and can function as both a noun and an adjective. As a noun it refers to a field of study or expertise; as an adjective it describes someone or something as professional or specialized.
你大学学的什么专业?
Nǐ dàxué xué de shénme zhuānyè?
What major did you study in college?
这家店的服务非常专业。
Zhè jiā diàn de fúwù fēicháng zhuānyè.
The service at this store is very professional.
他打算换一个更有前景的专业。
Tā dǎsuàn huàn yī gè gèng yǒu qiánjǐng de zhuānyè.
He plans to switch to a major with better prospects.