This problem can be solved by temporarily excluding the incomplete group from the message selector, or by copying the group to an in-memory or persistent store for completion later.
这个问题可以通过将不完整的组临时从消息选择器中排除得到解决，也可以将该组复制到内存中或持久性存储中，以便稍后完成。
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。
An event group profile object defines a selector string which determines which events belong to this group.
事件组概要对象定义了选择器(selector)字符串来决定哪些事件属于这个组。
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