EPL是一种强大的语言，可使开发者实现对事件的全程查询(从输入数据中“提取”事件并调用你的业务逻辑(POJO))。
EPL is a powerful language that enables you, the developer, to implement a comprehensive range of queries to "extract" the events from the incoming data and invoke your business logic (POJO).
但是大多数时候，需要将业务逻辑应用到数据中，这要求将数据提取为合适的数据类型。
But most of the time, you want to apply business logic to the data, which requires that the data be extracted to an appropriate data type.
因此，提取后端数据的逻辑包装在Work对象中。
Therefore, the logic of fetching the back-end data is wrapped in a Work object.
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