How much experience does he bring to this specialized work?
他使用了多少经验来干这项专业工作？
All those persons who are not members of a given profession or other specialized field.
外行所有那些不属于某职业或其它专业领域的成员
A secondary area of specialized academic study, requiring fewer courses or credits than a major.
辅修专业学术研究的第二个特定领域，其要求的课程和学分比主修课要少
