重复序列中的每个输出代码块都有自己的内部位置指示符，代码块中的任何控件都可以通过XPath扩展index访问这个指示符。

Each block of output code within a repeated sequence has its own internal position indicator, and any control within such a block can access that indicator through the index XPath extension.

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蛋白质内部重复片段在蛋白质序列进化的过程中具有重要意义。

Internal repeating segments in proteins may play important roles in functional evolution of proteins.

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