The definition also exclude the majority of teachers,despite the fact that teaching has tradition

The definition also exclude the majority of teachers,despite the fact that teaching has tradition
这一定义也把大多数教师排出在外,尽管传统上教学一直是许多知识分子借以谋生的方法.
哪位能通俗易懂的讲讲whereby 在这里的用法和意义啊