他可以使用流活动来建模并行性，但流具有必须在建模时确定分支数量的缺点。
He could model parallelism using a flow activity, but a flow has the disadvantage that the number of branches must be known at modeling time.
他可以使用流活动来建模并行性，但流具有必须在建模时确定分支数量的缺点。
He could model parallelism using a flow activity, but a flow has the disadvantage that the number of branches must be known at modeling time.
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