清单9展示了主程序循环的开始部分。

Listing 9 shows the beginning of the main program loop.

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ITERATE：将控制转移到某个带标签的循环的开始部分。

ITERATE: Used to transfer control to beginning of a labeled loop.

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回收部分的最后一步与加热和制浆的生产过程的最后一步相似——在循环再次开始之前。

The last step in the recycling section is similar to the last step in the production process with heating and pulping—before the cycle begins again.

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