Components of an application, including modules and libraries, can be at different versions.

一个应用程序的各个组件(包括模块和库)可以是不同的版本。

youdao

DBC is especially valuable when you're dealing with external components or libraries and need to ensure that the data your application passes to them and receives from them is correct.

在处理外部组件或者库，并需要保证应用程序传递给它们的数据和从它们那里接收的数据是正确的时候，DBC特别有用。

youdao

However, we need to keep in mind the significant amount of reuse that has been achieved by using OO concepts and related ideas (e.g. frameworks, libraries, components, etc).

然而，我们需要记住，通过使用面向对象的概念和相关的想法(例如：框架、库、组件等等)，已经做到了很大程度的重用。

youdao

Because of the point above, most of the libraries for these shared components are written and updated first in PHP.

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