At the start of each iteration, the system availability indicator determines whether to retrieve the next message for processing, or to suspend processing by scheduling a Human Task.

在每次迭代的开始，系统可用性指示器判断是获取下一条消息以进行处理，还是通过安排一个Human Task来暂停处理。

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Finally, we allow the developer working on the task to suspend a set of changes (see Figure 6), which reverts all of the code to its state before the change was started.

最后，我们允许开发员处理暂停一系列变更的工作(参见图6)，在开始变更之前这会将所有的代码转化为其状态。

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