流程只能调用或订阅到下游层中的子流程的事件，如箭头所示。
Processes can only call or subscribe to events from sub-processes in downstream layers, as indicated by the arrows.
当这些子组件的终止操作完成时，该流程就会最终处于终止状态，同时产生“流程已终止”事件（21005）。
When the termination of these subcomponents is complete, the process ends in the terminated state and a "process terminated" event (21005) is generated.
一个启动事件指示流程(或子流程)的开始。
A start event indicates the start of process (or a subprocess).
错误边界事件用来指示任务或子流程的故障。
An error boundary event can be used to indicate a fault on a task or a subprocess.
子流程和事件处理将在第6章讨论。
Sub-processes and event handling will be discussed in chapter 6.
子流程是一种复合活动，它包括多个其它活动：任务，网关和事件。
A subprocess is a compound activity, which can contain multiple other activities including tasks, gateways and events.
首先注意子流程总是从开始事件开始。
First note that a subprocess always starts with a start event.
通过错误开始事件处理失败的信用卡异常，在子流程捕获异常。
This exception is caught within the subprocess by the error start event handling the bad credit card exception.
一个启动事件指示流程(或子流程)的开始。它看起来是一个圆(可能)内部有一个小图标。
The 'none start event' is drawn as a circle without an icon inside, which means that the trigger is unknown or unspecified.
一个启动事件指示流程(或子流程)的开始。它看起来是一个圆(可能)内部有一个小图标。
The 'none start event' is drawn as a circle without an icon inside, which means that the trigger is unknown or unspecified.
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