Indeed, in RUP, an iteration is not necessarily a sequence of activities; it can be a multifaceted combination of activities, including some that may be done in parallel.
事实上，在RUP中，一次迭代不一定是一个活动序列；它可以是一个活动的多方面组合，包括一些可能并行完成的活动。
The parallel combination fragment element needs to be used when creating a sequence diagram that shows parallel processing activities.
当创造一个序列图，显示并行处理活动的时候，需要使用并行组合碎片元件。
Therefore, consider a combination of MapReduce-style parallel processing and load balancing when planning to process a large amount of data on your cloud system.
因此，在计划在云系统上处理大量数据时，考虑MapReduce样式并行处理和负载平衡的组合。
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