这是重要的，因为系统测试有时为该迭代并行地开发测试应用程序及产品功能。
This was important because system test was sometimes developing test applications in parallel with the product functionality for that iteration.
有时按顺序执行的一些任务也可以并行执行。
Sometimes tasks performed sequentially could be done in parallel.
有时，特别是出现并行用户交互的情况下，不允许用户查看其他用户的决策。
Sometimes, particularly in parallel user interactions, users aren't allowed to see the other users' decisions.
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