Roundness is an abstract term, so long as one considers it by itself and separates if from any subject that is round.
“圆”这个字如果单就其本身而言，而不与任何圆形物体相联想时，它是一个抽象名字。
Property right is not a pure legal or economic abstract term, but a reality with historical and social elements.
产权不是一种纯粹法律的或经济的抽象，而是充斥着历史、社会因素的现实存在物。
Unit of Learning: An abstract term used to refer to any delimited piece of education or training, such as a course, a module, a lesson, etc.
学习单元：一个抽象的术语，是指任何被划定范围的教育或者培训 单元，如一个课程，一个模块，一节课等。
Unit of Learning: An abstract term used to refer to any delimited piece of education or training, such as a course, a module, a lesson, etc.
学习单元：一个抽象的术语，是指任何被划定范围的教育或者培训 单元，如一个课程，一个模块，一节课等。
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