Citizen is a historical concept; different time requires different civic identity and quality.
公民是一个历史的概念，时代不同，公民的身份和素质要求不同。
Historical transition is not an abstract concept but clear to see.
历史的过渡并非抽象的概念，在此一目了然。
This paper is an historical study of the concept of freedom.
本文对自由概念进行了学理考证。
The concept of the university education has experienced a long time of historical change.
大学教育理念经历了一个漫长的历史演变过程。
The concept of the university education has experienced a long time of historical change.
大学教育理念经历了一个漫长的历史演变过程。
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