这个元素允许程序员获取一组节点，按某些标准来进行分组，然后处理由那一选择过程组成的每一个组。
This element allows the programmer to take a set of nodes, group it by some criteria, and then process each group formed by that selection process.
整个流水线生产过程涉及到视频编辑、拼接、剪辑与后处理；所有的软件工具都会基于一种标准化的格式。
The pipeline production process involves much video editing, splicing, cutting and post-processing; and the software tools all work on a standardised format.
结果：获得“窝别效应”及其标准误的估计，以及在考虑了“窝别效应”之后处理因素作用有无及其大小的估计。
Results: the estimates of the effect of litter, its standard error and the effect of treatment controlling the effect of litter were obtained.
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