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.

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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.

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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).

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