In Figure 3, the gear box represents abstractions that deal generically with some fundamental data structure, and the yellow box represents portable code, encapsulating data inside it.

在图3中，齿轮箱代表处理一些基础数据结构的抽象，而黄色箱代表可移植代码，将数据封装在里面。

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Thus, in addition to encapsulating data, it encapsulates data access logic.

因此，除了封装数据，也封装了数据访问逻辑。

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Thus, in addition to encapsulating data, it encapsulates data access logic.

因此，除了封装数据，也封装了数据访问逻辑。

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