然后此方法从网站返回的字符串中提取最新的交易价格，并将数据返回调用程序。
The method then extracts the last trading price from the string returned by the Web site, and returns that value to the caller.
由于能在接收到集成视图请求时实时地访问源数据，因此数据联合将始终返回最新的源信息。
Due to the real-time access to source data upon receiving a request to the integrated view, data federation will always return the most current source information.
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