介绍吴云定教授治疗腰椎管狭窄症的经验。

This article introduces Professor Wu Yunding's experience in the treatment of lumbar spinal stenosis.

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但是，云彩与雨还不是一回事。云要变成雨，取决于一定的条件，这一点是容易理解的。

But the cloud is not rain as yet; the change into rain will depend upon circumstances that may be easily guessed.

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在所有云计算环境中，设置一定的存储空间并运行一个小服务器是很便宜的。

It is inexpensive to set up some storage space and run a small server at all the cloud computing environment vendors.

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