在海上地震勘探中，检波器经常发生漂移，室内资料处理时必须对其进行二次定位。
The geophone often shifts in the offshore seismic exploration, so it should be re-located in interior data processing.
通过求解磁场强度的变化，发现磁场强度最低点随一次地网和二次地网连接点的相反方向漂移的规律。
And then found the law that the lowest magnetic field intensity point location will drift to the opposite direction to primary grounding network and secondary grounding network junction moving.
构建了基于SDD算法的中文农业信息检索实验系统，验证大规模文档集下sdd算法的可行性和“二次主题漂移”模式的可行性。
Building the experiment system based on the SDD and validating the feasibility on large scale documents and "two theme shift" model.
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