平行式索引

例句：

1. 1.The book uses a parallel index to help readers navigate through the text.
   这本书使用平行索引帮助读者导航文本。
2. 2. The scientist used a parallel index to compare the results of different experiments.
   科学家使用平行索引来比较不同实验的结果。
3. 3.The researcher found that the parallel index was an effective way to organize and present data.
   研究者发现平行索引是一种有效的方法来组织和呈现数据。