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.
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.
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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