seq是用于索引文件名的序列文件。

DemoData.seq is the sequence file used to index the file names.

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第一个参数是一个文件序列号，用来组成结果文件名。

The first argument is a file sequence number, which will be used to form the result filename.

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to text节点将根据要用作文件名中的序列号的大小整数创建一个字符串。

The to text node creates a string from the size integer that will be the sequence number in the file name.

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