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。

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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。

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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。

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