清单2中的代码旨在查询到列表中的所有交易(若没有指定过滤条件的话)或者单个交易以及相关的项目信息。
The code in Listing 2 is intended to pull from the list either all transactions if no filter is specified or a single transaction together with the related project information.
还可以过滤列表提要或单元格提要的内容，从而使提要只返回匹配特定条件的行或单元格。
You also can filter the contents of a list feed or a cell feed, such that the feed returns only rows or cells matching specific criteria.
列表8表现的关联的一个特殊方面是使用了另一个关联(比如，CheckOne)作为过滤值的条件。
One of the particular aspects of the relation presented in Listing 8 is that it makes use of another relation (for instance, CheckOne) as a condition for filtering values.
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