示例：若分区A有1000文档，分区B有10文档，"数据库"词项在各分区有不同IDF值。两分区结果分数处于不同尺度。
Those facts which the Law expresly condemneth, but the Law-maker by other
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Award-winning science fiction and horror writer died in Colorado on 21 February with family at his side
Иран нанес удар по американскому авианосцу «Авраам Линкольн»13:27
between 10 and 100 degrees, and account for thermal expansion, humidity, dust