Columns surrounded by quotation marks and prefixed with the "t" variable are based on XML element values, as the subsequent lines of the query indicate.

查询中后面的几行表明，用引号括起来、并且以变量“ t ”为前缀的列是基于XML元素值的列。

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Because we'd like our Lists to be generic in the type of element they contain, we'd like our static factory method to take an argument of type variable t and return an instance of List.

因为我们希望List成为其所包含的元素类型的泛型，所以希望静态factory方法带有类型变量t这一参数并返回List的实例。

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