The XQuery language does not provide an explicit group-by construct.
XQuery语言不提供显式的group - by结构。
As a best practice, change the default value of each instance-level authority parameter to an explicit group name in order prevent unintended super-user access.
作为一项最佳实践，应该将每个实例级权限参数的缺省值改为一个显式的组名，以防止意料之外的超级用户访问。
The results show that upon complicated operation task, the learning effect of implicit group exceeds that of explicit group.
结果显示：对于复杂的操作任务，内隐学习比外显学习更有效。
The results show that upon complicated operation task, the learning effect of implicit group exceeds that of explicit group.
结果显示：对于复杂的操作任务，内隐学习比外显学习更有效。
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