Summarized the domestic and foreign research present situation;
概括了国内外研究现状；
The present situation of fault unsealing research is summarized.
综述了断层开启机制的研究现状。
The first part introduces the research background, present situation and the methods.
第一部分介绍了现实背景、研究现状、以及研究方法；
The present situation of research on magnetic ink all around the world was reviewed.
综述国内外磁性油墨的研究现状。
The present situation of research on magnetic ink all around the world was reviewed.
综述国内外磁性油墨的研究现状。
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