The data might come from an incoming event, be calculated, or be retrieved from an external data source.

这些数据可能来自传入的事件，可能进行了计算，或者检索自外部数据源。

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The Virtual Field activity provides synchronous access to an external data source from a Domino application.

Virtual Field活动对来自Domino应用程序的外部数据源提供同步访问。

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The developers starts from creating tables or data entities using the built-in database or an external data source.

开发者首先要使用内建的数据库或者外部数据源创建表或者数据实体。

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In the simplest terms, an API is a set of code conventions which programmers can use to interact with an external data source or web service.

FORBES: With All Content Moving Mobile, Karen McGrane Writes, The API's The Thing