如果一个索引是负值，意味着是从列表末尾向前倒序计数查找相对应的位置。

If an index has a negative value, it counts backward from the end of the list.

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在估计无线传感器网络未知节点位置时，如何使用与距离无关的贯序蒙特卡罗算法?。

How to use Sequential Monte Carlo method for range-free localization scheme when we estimate the unknown node position in Wireles Sensor Networks?

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大青山地区所建立的孔兹岩地层层序及其在太古宙地层系统中的位置，无疑对相邻地区高级变质区的岩石地层研究有重要借鉴意义。

The investigation of the khondalite sequence and its position in the stratum system of Archean in Daqingshan region is very useful to study the high-grade region of adjacent areas.

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