Universities offer courses in a wide variety of disciplines. At some point, generally by the end of the second year, students are required to declare a major. In some cases, students begin classes in a program of study from the minute they enter the university.
Some college freshmen seem to have been called to a profession at an early age,
and their determination to become a teacher, or doctor, or engineer has never wavered.
请问文中的declare如何理解？
declare a major. 选择专业。declare：正式、公开的声称、宣布。即向校方正式提源于己学什么专业。这你应该猜都能猜出来。
