Each path from a chance node (uncertain event) is given a weight representing the probability of outcome listed on that path to occur.
每个机会节点（不确定事件）都被赋予一定比重，比重代表事件结果发生的可能性。
There is a slight chance that each node will need to be rebooted while working on a job submitted by the master node.
各个节点在执行主节点所提交的作业时，需要重新引导的机率较小。
The chance of rack failure is far less than that of node failure;
机架失效的概率要远低于节点失效；
The chance of rack failure is far less than that of node failure;
机架失效的概率要远低于节点失效；
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