The columns that were added to the preceding stage of the XML stage can be modified, removed, or new columns can be added.

添加到XML Stage的前一阶段的列可以修改、删除，也可以添加新列。

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They found that success in learning correlated with the amount of stage-2 non rapid eye movement (NREM) sleep, the stage preceding deep rapid eye movement (REM) sleep.

他们发现学习上的成功和第二阶段非快速眼动（NREM）相关。 NREM是深快速眼动（REM）睡眠之前的阶段。

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As shown in Figure 4, you can see the column file_names, which was added in the preceding External Source Stage.

如图4所示，您可以看到列file_names，其被添加到前面的External Source Stage。

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