在开发模式时，我们为将来的模式元素创建占位符。

As the pattern develops, we create placeholders for future pattern elements.

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当需要它时，我们将给出一个占位符字符串。

When it is needed, we'll provide a placeholder string.

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占位符链接就是与开始时未定义目标的链接。

A placeholder link is a link with an initially undefined target.

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占位符链接就是与开始时未定义目标的链接。

A placeholder link is a link with an initially undefined target.

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