This element is to provide randomization for a test run sequence, rather than running the test sequentially, by adding random selector.
这个元素用来通过添加随机选择器，为一个测试运行序列提供随机选择，而不是按照测试顺序地运行。
We then set up a second selector that specifies a sequence number of 2 along with the group identifier.
然后，我们将设置第二个选择器，以执行序列号2和相应的组标识符。
We start with a selector matching any message with a sequence number of 1, and once we have that message, we determine which group it is in.
首先，我们使用选择器来匹配任何序列号为1 的消息，获得此消息后，我们将确定其所属的组。
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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