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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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。
She calls Richard into a meeting room and they start writing down what they learned during the proof-of-concept exercise. For example.
因此她和Richard在会议室中写下了概念论证过程中的经验。
One popular exercise is the "PNF" diagonal shoulder exercise from the Proprioceptive Neuromuscular Facilitation concept.
一种流行的练习是来源于神经肌肉促进技术理念的PNF螺旋对角肩部练习。
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