Another key insight that the working group had during the development of the sample application had to do with the sequence diagrams.
在样本应用程序的开发过程中，工作组取得的另一个重要经验与序列图有关。
Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key.
依据指定的索引键选择器函式来群组序列的项目，并从每个群组及其索引键建立结果值。
Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key.
依据指定的索引键选择器函式来群组序列的项目，并从每个群组及其索引键建立结果值。
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