他认为消极自由只是自由的机会概念（opportunity-concept），而积极自由则是自由的应用概念（exercise-concept）。自由的实际障碍不仅有外部的、也有内部的。
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exercise concept 履行概念
In either case, whether you use Amazon EC2 or another vendor, you must first create a small proof of concept before committing to a full-blown disaster recovery exercise.
无论是使用Amazon EC2还是其他提供商的服务，您必须先进行小规模的概念验证，然后再执行全面的灾难恢复工作。
By means of the methods of literature and questionnaire, the present paper has done research on university students concept of health and characteristics of physical exercise behavior.
采用文献资料与问卷调查法，分析大学生的健康观念与体育锻炼行为的特征。
By means of the methods of literature and questionnaire, the present paper has done research on university students' concept of health and characteristics of physical exercise behavior.
采用文献资料与问卷调查法，分析大学生的健康观念与体育锻炼行为的特征。
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