没有恰当的导入和导出定义，通信将失败。
The communication fails without the proper import and export definition.
除了这些变更，您需要为每个请求处理程序创建一个服务导出定义。
In addition to these changes, you need to create a service export definition for every request handler.
导出定义了可以提供的一组函数，而无需指定提供这些函数的组件。
An export defines a set of functions that can be provided, without specifying the component that is going to provide them.
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