模型中视角的内容是围绕特定的主题收集的，类似于 表 2 中的内容。

The contents of the viewpoints in a model are gathered around particular themes, as Table 2 demonstrates.

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他们通常检索单纯匹配检索词的网页，而并不集中于主题内容的检索上。

They often retrieve pages that include a mere passing mention of the search term, but do not really focus on the subject at all.

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很多时候取决于主题和内容。

As always, much depends on the topic and the context.

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