如果起作用了，为什么要以这个价格更新呢？
这个主题可以是很明确的，比如某只股票的价格更新，也可以是比较宽泛的，比如来自数据库的事件。
This topic can be literal, such as price updates on a particular stock, or figurative, such as events from the database.
从剩下的股票中，挑选出那些目标价格得到更新但现在的市场情况已经与当时建立股票池式的情况差异非常大了的股票。
From the remaining stocks, throw out those target-price updates and initial stock picks made when the character of the stock market was very different from the current market.
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