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。

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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。

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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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But this concept of human-powered exercise equipment has not become mainstream.

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My friend and former Morgan Stanley colleague, Byron Wien, now at Blackstone Group (BX), initiated this concept a few decades ago, which I always find a useful intellectual exercise.

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