构建一个时间系列后，您可能想要检索历史数据。
Once you have built up a time series, you will probably want to retrieve historical data.
实际的Expect应用程序通常用于解析命令行参数、将结果显示在分栏的表格中、从数据库中检索历史数据、显示图形用户界面 (GUI)，以及更多的用途。
Real Expect applications often parse command-line arguments, tabulate results in columns, retrieve historical data from databases, display graphical user interfaces (GUIs), and much more.
过滤器用于指定时间戳，它是为了只检索所关心的时间段中的历史数据。
A filter is used to specify a timestamp in order to only retrieve the historical data for the time period that is of interest.
因此，数据库历史数据存储在一个ASCII文件中，并放在备份镜像中，我们可以从中检索和处理它。
Therefore, the database history is stored in an ASCII file and included in the backup image where we can retrieve and process it.
利用系统积累的反馈历史数据来改善图像检索的效果引起了越来越多的关注。
An image retrieval method using the accumulated user's relevance feedback records is presented to improve the performance of image retrieval.
利用系统积累的反馈历史数据来改善图像检索的效果引起了越来越多的关注。
An image retrieval method using the accumulated user's relevance feedback records is presented to improve the performance of image retrieval.
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