1.(学校学科分类)specialized subject; special field of study; speciality; discipline 2.(生产部门的各业务部门) specialized trade or profession; special line 
Do you belong to any professional associations ?你是哪个专业学会的？
2.Banks have developed along specialized lines .银行向专业方向发展。
3.His work lacks that professional touch .他的作品缺乏那种专业修饰。
4.Her voice should be professionally trained .她在运嗓上应接受专业训练。
5.His field of expertise was steroids .他的专业领域是甾族化合物。
6.The department offers four specialities .这个系有四个专业。
7.Biochemistry is his specialty .生物化学是他的专业（专长）。
8.Teams were formed which had good or bad luck .生死难卜的专业小组组织起来了。
9.You need a professional to sort out your finances .你需要专业人士替你管理财务。
10.Many specialistic techniques contribute to archaeology .许多专业技术对考古学作出贡献。