The ranking system ranks the documents to ensure that the highest ranking documents may include at least one document covering each topic, that is, one document from each of the groups.
该排列系统将文档排序以保证最高排列文档可以包含覆盖每一个主题的至少一篇文档，那就是说，来自每一个组的一篇文档。
The ranking system ranks the documents to ensure that the highest ranking documents may include at least one document covering each topic, that is, one document from each of the groups.
该排列系统将文档排序以保证最高排列文档可以包含覆盖每一个主题的至少一篇文档，那就是说，来自每一个组的一篇文档。
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