One theory and arithmetic "dual filter scan" of seeking peak in spectral analysis is brought forward and used for demarcate of spectrum and other analysis.
提出光谱分析寻峰的一种原理和实现的算法“两层扫描筛法”，用于光谱的标定和其它分析。
They can filter out certain words from visited sites or scan for viruses.
它们可以过滤掉来自被访问站点的特定词汇或可以扫描病毒。
This means that a sequential scan of the table will be faster than an indexed read, and we cannot play with the filter criteria.
这意味着对表的顺序扫描比索引读取更快，我们无法遵循指示器标准。
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