实现类型指定sca容器应该如何调整环境的条件，以恰当地执行组件。
Implementation types specify how the SCA container should condition the environment for proper execution of the components.
在本系列的第4部分中，我们将探索更多的版本控制特性，比如条件包含和组件覆盖。
In Part 4 of the series, we will explore more versioning features such as conditional inclusion and component override.
在软件开发里，程序员编写前置和后置条件来确立特定软件组件的角色。
In software development, the programmer writes pre - and postconditions in order to establish the role of a particular software component.
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