可以通过字符串来定位关键代码。

Through the string to locate the key code.

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最初，枚举数定位在字符串中第一个文本元素前。

Initially, the enumerator is positioned before the first text element in the string.

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最初，枚举数定位在字符串中第一个文本元素前。

Initially, the enumerator is positioned before the first text element in the string.

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