The master module or another specific module can send the data to an external unit like a computer or database for further processing.

主模块或另一特定模块可把数据发送给类似于计算机或数据库之类的外部设备，以便进行进一步的处理。

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External services may not be readily executable in unit test environments; for example, they may depend upon infrastructure not available to the developers.

外部服务在单元测试环境中不能随时执行，例如，它们可能依赖于开发人员无法使用的基础结构。

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To me, unit tests are fast running tests that typically test individual classes that don't have heavy external dependencies like databases.

对我来说，单元测试是快速运行的 测试，通常测试没有大的外部依赖项（如数据库）的单独的类。

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