In order to calculate the inventory requirements for each entry in the sales leads feed, the production manager needs to create a master detail data structure.
为了计算销售机会提要中每个条目的库存需求，生产经理需要创建一个主细(master detail)数据结构。
The data structure accepts the visitor object and will call its visit method for every entry in the data structure.
该数据结构接受visitor对象，并对数据结构中的每一项调用其visit方法。
A structure containing the data for a blog entry.
一种包含博客文章数据的结构。
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