The actual field being mapped is an instance of Author, and you want to take the identifying part of that object—the id—and map it to a column called author_id.

映射的实际字段是 Author 实例，需要找到该对象的标识符部分 — id — 并将其映射到列 author_id。

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When exposed to a radio signal, they use its energy to send back the information they contain, mostly a long number identifying an object.

当这些标签暴露在无线电信号下时，它们将利用信号的能量发回其所包含的信息，这些信息大部分是用于识别物品的一长串数字。

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Figure 1 introduces the Identifiable and Auditable interfaces, which define the API for identifying object instances and setting audit information on object instances.

图1引入了Identifiable和Auditable接口，这些接口定义的API用来标识对象实例和设置对象实例的审计信息。

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In this case, the cyber identity of this file would be a full set of its cyber coordinates in the IP subspace: the computer IP address, its MAC address, a Port number associated with the particular application, and the file name would constitute the full set of cyber coordinates, singularly identifying a cyber object (our file) in cyberspace.

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