LaTeX文档中新增标签后，第一次编译时会得到警告信息：
LaTeX Warning: There were undefined references.LaTeX
阅读背景：
LaTeX Warning: There were undefined references.解决办法以及数学公式、图、表、页码的交叉引用_阿素.(◍•ᴗ•◍)的博客
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