Handlers provide the ability to perform methods and services as part of a flow for a larger service, as shown in Figure 1.

处理程序提供了将方法和服务作为一个大一些的服务的流的一部分执行的能力，如图1所示。

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However, there is a clear distinction between events that trigger a change in state as part of the normal flow and events that trigger state changes and are not part of the normal flow.

但是，那些触发状态变化且是正常流程一部分的事件与那些触发状态变化但不是正常流程一部分的事件之间有明显的差异。

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Now, considering the middle part of the flow, let's look at Figure 20.

现在，让我们看一下图20，并注意流的中间部分。

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In part, managers say slower cash-flow growth is a matter of simple math.

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