接着概述现有的平面、层次以及位置辅助路由协议或算法并做了必要的分析和比较；

Second existing routing protocols or algorithms are outlined and compared as the classification of plane, hierarchical as well as the position aided ones.

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介绍了一种射流与PDC刀具的配合方式，即水射流位于刀具底部适当位置辅助刀具切割破碎岩石。

The paper introduces a fitting method between water jet and PDC bit tool, that is, aid bit tool cut rock while water jet is directed from suitable location of bottom of bit tool.

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通过仿真，文中给出了VTBR算法与传统位置辅助路由协议的性能对比分析，对数据包传输成功率和平均路径长度这两个性能参数进行了评价。

The performance comparison between VTBR and traditional position based routing protocols shows that VTBR algorithm has a much higher packet delivery success rate and a shorter average path length.

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Then it undergoes a reorganization in which the vice neutrons, assistants to the neutron, the assistants to the vice neutrons exchange places.

而开始重组,其中，副中子，辅助中子，辅助副中子，开始交换位置。

麻省理工公开课 - 固态化学导论课程节选