Timeouts are not on the tasks themselves, but rather on the task node.

超时不是发生在任务自身，而是发生在任务节点上。

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Timeout handler (Listing 16) is invoked when a task node timer is fired.

任务节点计时器触发调用的超时处理器(清单16)。

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Task instance completion is accompanied by a transition (typically back to task node).

任务实例的完成伴随有一个变迁(一般是回到任务节点)。

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