Try to include your primary keyword phrases in your headings.

因此，你应该试图在标题中写上关键词短语。

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The match keyword is used here because not every column relates to a UML attribute; as presented earlier, primary and foreign keys are added in order to map UML associations as well.

在这里使用匹配关键词是因为不是所有列都与UM L属性相关；正如前文介绍过的，添加主键和外键是为了同时映射uml关联。

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