注意，清单1中选项的次序是任意的，而且大多数选项有短格式。

Note that the order of the options in Listing 1 is arbitrary, and most have a shorter version.

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短格式（40分钟）省略了一些准备动作和说明， 练习更加流畅连贯。

Short Form (40 minutes) omits some preparatory poses and commentary for a more fluid, continuous practice.

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对于每个选项，case语句会尝试识别该选项——使用短格式或长格式并设置一个变量。

For each option, the case statement then attempts to identify the option, using either the short or long format and setting a variable.

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