可以彼此组合，以封装在特定业务需求的上下文中有意义的较高价值的业务功能。
Can be composed with each other to encapsulate higher value business functions that make sense in the context of specific business requirements.
所有不同类型的触发器都能够单独使用，也可彼此组合，构建更加精准、完善的指令。
All the different trigger types can be used independently or in conjunction with each other to build more elaborate instructions.
这些方法的签名可使它们彼此组合和嵌套，因此从一个构造返回的工作流对象可传递到下一个构造。
The signatures of these methods enable them to be combined and nested with each other, so that the workflow object returned from one construct can be passed to the next.
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